Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2009 to June 2011．
A．would serveB．servedC．was served D．had been served
B
考查時態(tài)。根據(jù)本句的時間狀語：from February 2009 to June 2011說明在過去的時間發(fā)生的事情，使用過去時即可。Serve沒有被動語態(tài)。故B正確。
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