Computers in offices and homes since 1970s．A．have been usedB．had been us_刷题宝

题干

Computers in offices and homes since 1970s．

A．have been used

B．had been used

C．was

D．has been used

上一题下一题 0.4难度单项选择更新时间:2013-04-09 09:31:45

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