问题

Before joining the Department of Defense, MrPanetta ______ as director of the CIA from February 2009 to June 2011.[ ]

A: would serve
B:efore joining the Department of Defense, Mr Panetta ______ as director of the
C: was served
D: had been served

正确答案是：

同类题型

The novels written by the author sell best, but five years ago no one could have imagined how great a role he _____in the literary world

She’s already two hours lateWhat ______ to her?

Look at the ____ ! It’s ____ heavily now.

ST Petersbury was in ruins:_______fires burned everywhere.

I’ll come to listen to your speech at 9:30 tomorrow morning.— I regret to tell you that by then my speech ____