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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 【查看更多】

     

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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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