Computersin offices and homes since 1970sA. have been usedB. had been used C. was D. has

发布时间：2020-08-17 02:12:34

Computers    in offices and homes since 1970s．
A. have been used
B. had been used
C. was
D. has been used

网友回答

(答案→)A. have been used
B. had been used
C. was
D. has been used
解析：句意：自从20世纪70年代开始，电脑被用在办公室和家里。因为与since连用时，前面的常用现在完成时，又因为Computers是复数，故选A。
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