Before joining the Department of Defense, Mr Panetta as director of the CIA from Februa

发布时间：2020-08-17 00:10:04

             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

网友回答

A. would serve
(答案→)B. served
C. was served
D. had been served
解析：考查时态。本题叙述了过去发生的事情，所以使用一般过去时。句意：在加入国防部之前，Mr． Panetta在2009年2月到2011年7月在中央情报局工作。本题只是叙述了过去发生的事情，并没有反应出对现在的影响，也没有延续到现在，使用使用过去时。故B正确。
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