题目内容
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
B
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题目内容
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
B