Computers in offices and homes since 1970s．A．wasB．had been usedC．have b_刷题宝

题干

Computers in offices and homes since 1970s．

A．was

B．had been used

C．have been used

D．has been used

上一题下一题 0.64难度单项选择更新时间:2014-05-27 05:19:47

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