By the time I back they up ten satellites.A. came-have sent B. came-had sentC. 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.第一个是一般过去题目和参考答案——青夏教育精英家教网——

题目内容

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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