15、Mr. Smith will not answer our questions until he is sure that we ________ the meaning of each word in the sentence.

A. find out                                  B. have found out       

C. had found out                         D. will have found out

15、B

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Mr. Smith will not answer our questions until he is sure that we ________ the meaning of each word in the sentence.

A. find out                                  B. have found out       

C. had found out                         D. will have found out

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