Computersin offices and homes since 1970sA. wasB. had been usedC. have been usedD. has be

发布时间：2020-08-17 10:55:14

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

网友回答

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