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
B
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。
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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