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    【题目】The computer _____ in offices and homes since the 1970s.

    A. has used B. has been used

    C. had used D. had been used

    【答案】B

    【解析】B考查时态。句意：自上世纪70年代以来，计算机就一直被用于办公室和家庭。由时间状语since the 1970s可知用现在完成时态；计算机是被应用的，用被动语态，故选B。

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