Computers in offices and homes since 1970s．
A. have been used
B. had been used
C. was
D. has been used
Computersin offices and homes since 1970sA. have been usedB. had been used C. was D. has
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解决时间 2021-03-21 04:20
- 提问者网友：献世佛
- 2021-03-20 19:36
最佳答案
- 五星知识达人网友：时间的尘埃
- 2021-03-20 20:53
(答案→)A. have been usedB. 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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- 1楼网友：长青诗
- 2021-03-20 21:17
对的，就是这个意思
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