Before joining the Department of Defense, Mr． Panetta _______ as director of the
题型：不详难度：来源：
Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2009 to June 2011．| A．would serve | B．served | C．was served | D．had been served |
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答案
| B |
解析
| 考查时态。根据本句的时间状语：from February 2009 to June 2011说明在过去的时间发生的事情，使用过去时即可。Serve没有被动语态。故B正确。 |
举一反三
---- I ’m sure Andrew will win the first prize in the final.
---- I think so. He for it for months. | A．is preparing | B．was preparing | C．had been preparing | D．has been preparing |
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By the time our teacher arrives tomorrow, all the work _____,with which he will be content.| A．is accomplished | B．will have been accomplished | | C．will be accomplished | D．has been accomplished |
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In the past few years, sea ice ____ in the Arctic as a result of global warming.| A．had melted | B．has been melting | C．melted | D．is melting |
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—Tom, you didn’t come to the party last night?
— I _____ , but I suddenly remembered I had homework to do.| A．had to | B．didn’t | C．was going to | D．wouldn’t |
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He would have been a doctor 20 years ago, but he _____ to be a teacher.| A．chooses | B．chose | C．had chosen | D．has chosen |
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