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    精英家教网 > 初中英语 > 题目详情

    By the time I _____ back they ____ up ten satellites.

    A. came…have sent B. came…had sent

    C. come…have sent D. had come…sent

    B 【解析】句意：当我回来的时候，他们已经发送了10颗卫星。By the time引导的时间状语从句，主语是过去完成时，从句用一般过去时态，第一个是一般过去时态，短语come back表示回来；短语sent up表示发送，这里是过去完成时，其结构是had done的形式。根据题意，故选B。
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