Computers in offices and homes since 1970s．

A．was B．had been used C．have been usedD．has been used

 

C

【解析】

試題分析：考查動詞的時(shí)態(tài)與語態(tài)。句意：自從20世紀(jì)70年代以來，電腦就被廣泛的應(yīng)用在辦公室與家庭。根據(jù)時(shí)間狀語sinec 1970s，這是現(xiàn)在完成時(shí)的標(biāo)志，電腦與應(yīng)用之間是被動關(guān)系，故選C項(xiàng)。

考點(diǎn) : 考查動詞的時(shí)態(tài)與語態(tài)

 

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