The extra room _______ very useful when we had visitors.A．was provedB．provedC．ha_刷题宝

题干

The extra room _______ very useful when we had visitors.

A．was proved

B．proved

C．has been proved

D．has proved

上一题下一题 0.64难度单项选择更新时间:2012-05-27 01:49:10

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