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＞＞＞All the colour TV sets ____ out before we arrived .[ ]A. a..
All the colour TV sets ____ out before we arrived .
A. are sold&&&&&&&&&&&&
B. have been sold&&&&
C. will be sold&&&&&&&&&&
D. had been sold
题型：单选题难度：中档来源：同步题
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据魔方格专家权威分析，试题“All the colour TV sets ____ out before we arrived .[ ]A. a..”主要考查你对&&过去完成时的被动语态&&等考点的理解。关于这些考点的“档案”如下：
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因为篇幅有限，只列出部分考点，详细请访问。
过去完成时的被动语态
过去完成时的被动语态的概念：
过去完成时的被动语态是过去完成时态和被动语态的叠合。表示过去某一时间以前已经完成的动作，常与by，before等引导的时间状语连用。由“had+been+过去分词”构成。过去完成时态的被动语态的构成：
1）过去完成时的被动语态的肯定式为：had + been + done。如：The task had been finished before 12:00 yesterday. 2）过去完成时的被动语态的否定式为：have / has + not + been + done。如：The task hadn't been finished before 12:00 yesterday. 3）过去完成时的被动语态的一般疑问句需将had提到主语的前面。如：Had the task been finished before 12:00 yesterday? 4）过去完成时的被动语态的特殊疑问句为：疑问词 + had+ been + done。如：What time had the task been finished yesterday? 过去完成时被动语态的用法：
过去完成时由“had+过去分词”构成，表示在过去某一时刻或某一动作之前发生的动作或状态，句中常用by，before，until，when等词引导时间状语。如：We had built five new buildings by the end of last year. 过去完成时的被动语态有以下三种形式：（1）肯定结构：主语＋had been done＋其他成分（2）否定结构：主语＋had not been done＋其他成分（3）疑问句结构：had＋主语＋been done＋其他成分；&&&&&&&&& 疑问词＋had＋主语＋been done＋其他成分过去完成时的被动语态常用于以下情况：（1）表示过去某一时间以前已经完成的动作，常与by, before等引导的时间状语连用。 如：By the time he got to the school, the first period had been finished. &&&&&&& The classroom hadn't been cleaned before the teacher came. &&&&&&& How many buildings had been destroyed when the hurricane ended?&&&&&&&&&Had the new plan been discussed before the meeting? （2）在told, said, knew, heard, thought等动词之后的宾语从句中，若表示过去某一被动动作时，用过去完成时。 如：The said the production costs had been reduced. &&&&&&& The boy was reminded that his homework had not been handed in. &&&&&&& The media reported more than 1,000 people had been killed in the earthquake. （3）根据语意可以判断出动作先后的被动语态，用过去完成时。 如：As the assignment had been done, he went on to search the Internet. &&&&&&& He did what he had been told to. 另：当从句由after，before，when或assoonas引导时，主句和从句都可以用一般过去时。 如：When he arrived, he called her. &&&&&&& They locked the door before they left.过去完成时与现在完成时被动语态用法区别： 　　
现在完成时被动语态表示相对于现在来说已被完成的动作，过去完成时被动语态表示相对于过去某一时刻来说已被完成的动作。 　　例如：This polluted river has been cleaned. 这条被污染了的河流已被净化。 　　析：该句表示到现在为止这条河流已被净化。 　　例如：He said this book had been translated into Japanese. 他说这本书已被译成日语。 　　析：该句表示到他说话时所体现的时间为止这本书已被译成日语。
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相关词典网站：Do you have a colour TV?---- Yes,I have a good()A it B one C that D the one应该选B吧?B和D有什么区别啊?_百度作业帮
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Do you have a colour TV?---- Yes,I have a good()A it B one C that D the one应该选B吧?B和D有什么区别啊?
Do you have a colour TV?---- Yes,I have a good()A it B one C that D the one应该选B吧?B和D有什么区别啊?
应该选Bone是泛指,指代 a color TV,意思是我有一台电视机,而不是我有“这”一台电视机；而 the one 是特指,如果你想特指某一台电视机才用这个,比如：The TV is black.意思是“这”台电视机是黑色的. 上传我的文档
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How does a colour TV work
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How does a colour TV work.PDF
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A color TV screen differs from a black-and-white screen in three ways:There are three electron beams that move simultaneously across the screen. They are named the red, green and blue beams.The screen is not coated with a single sheet of phosphor as in a black-and-white TV. Instead, the screen is coated with red, green and blue phosphors arranged in dots or stripes. If you turn on your TV or computer monitor and look closely at the screen with a magnifying glass, you will be able to see the dots or stripes.On the inside of the tube, very close to the phosphor coating, there is a thin metal screen called a shadow mask. This mask is perforated with very small holes that are aligned with the phosphor dots (or stripes) on the screen.When a color TV needs to create a red dot, it fires the red beam at the red phosphor. Similarly for green and blue dots. To create a white dot, red, green and blue beams are fired simultaneously -- the three colors mix together to create white. To create a black dot, all three beams are turned off as they scan past the dot. All other colors on a TV screen are combinations of red, green and blue.In the next section, you'll learn about the color TV signal.
Please copy/paste the following text to properly cite this HowStuffWorks article:
Brain, Marshall.& "How Television Works"& 26 November 2006.& . &/tv.htm& &21 May 2015.
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The Black-and-White TV Signal
Painting the TV Screen
Composite Video Signal
Color TV Screen
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