When _________ where he had put the book, he kept silent.A．askB．askingC．to askD．
题型：不详难度：来源：
When _________ where he had put the book, he kept silent.| A．ask | B．asking | C．to ask | D．asked |
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答案
| D |
解析
| 考查省略句。当状语从句的主语和主句主语一致时，我们可以把状语从句的主语和系动词一起省略。本题省略了he was;句意：当他被问把书放到那里的时候，他什么都不说。 |
举一反三
__________ the experiment right, I tried again and succeeded.| A．Not having done | B．Having not done | C．Not doing | D．Not done |
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Ladies and Gentlemen, please remain until the plane has come to a complete stop. | A．seated | B．seating | C．to seat | D．seat |
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All flights___ because of the snowstorm, we decided to take the train. | A．were canceled | B．had been canceled | C．having canceled | D．having been canceled |
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When ____about his family, he is always refusing to answer.| A．asked | B．asking | C．being asked | D．mentioned |
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There is no need ______ because Mr. Smith is still sleeping.| A．to hurry | B．hurrying | C．hurry | D．hurried |
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