【題目】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考查時(shí)態(tài)。句意：自上世紀(jì)70年代以來，計(jì)算機(jī)就一直被用于辦公室和家庭。由時(shí)間狀語since the 1970s可知用現(xiàn)在完成時(shí)態(tài)；計(jì)算機(jī)是被應(yīng)用的，用被動(dòng)語態(tài)，故選B。

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