一 When did the computer crash?一 This morning, while I the reading materials do
题型：不详难度：来源：
一 When did the computer crash?
一 This morning, while I the reading materials downloaded from some websites.| A．have sorted | B．was sorting | C．am sorting | D．had sorted |
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答案
B
【考点】本题考查时态的用法 |
解析
| 首先根据时间状语this morning知道是发生过的事情，去除A、C两项，然后过去完成时的使用前提是有动作的先后顺序，然而本句指的是“今天早晨我正把从网上下载的阅读材料分类时电脑坏的。”指的是过去正在进行的动作用过去进行时，B项正确。 |
举一反三
---Did you ask Sophia for help?
---I ______ need to – I managed perfectly well on my own.| A．wouldn’t | B．don’t | C．didn’t | D．won’t |
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The manager ______ the workers how to improve the program since 9 am.| A．has told | B．is telling | C．has been telling | D．will have told |
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I don’t think she saw me just now. She_________ the beautiful vases.| A．just admired | B．had just admire | C．has just admired | D．was just admiring |
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–What did you say?
--So you _____________ to me.| A．won’t listen | B．didn’t listen | C．haven’t listened | D．weren’t listening |
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The best way to prevent the air polluting _____ , but the sky is still not clear.| A．is used | B．are used | C．has been used | D．have been used |
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