【題目】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

【答案】B

【解析】句意:當(dāng)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(dǎo)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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