题目内容
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
【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。
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