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We must try our best _ whose dictionary it is.A.to find out

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We must try our best _ whose dictionary it is.A.to find out B.finding out C.to look for
We must try our best _ whose dictionary it is.A.to find out
A .try one's best to do sth 是将要努力做的事,而doing sth 是正在做的事,那么主句应该用现在进行时,所以用动词不定时,find out 后面可以接宾语从句,而look for sth /sb 不能接宾语从句.