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

A. came…h(huán)ave sent B. came…h(huán)ad sent

C. come…h(huán)ave sent D. had come…sent

B 【解析】句意：當我回來的時候，他們已經(jīng)發(fā)送了10顆衛(wèi)星。By the time引導的時間狀語從句，主語是過去完成時，從句用一般過去時態(tài)，第一個是一般過去時態(tài)，短語come back表示回來；短語sent up表示發(fā)送，這里是過去完成時，其結(jié)構(gòu)是had done的形式。根據(jù)題意，故選B。
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