【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
在线课程【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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