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问题: 单选31

"We must keep a secret of the things ______ here",the general said,_______at the man in charge of the information office.
A.discussed,stared seriously
B. being discussed,seriously staring
C.to be discussed,seriously stared
D.discussed,stared

解答:

不缺谓语,选非谓语动词
stare看,要用主动,直接就能排除ACD
事情是被谈论,用被动,时间上没有先后,用现在进行时的被动语态
综上,选B