The room _______ very useful when we had visitors. A．was proved B．has been proved C．has proved D．pr...
2022-12-21 07:42:47 182次 2012-2013学年福建省高三第三阶段（12月）考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The room _______ very useful when we had
visitors.
A．was proved B．has been
proved
C．has proved D．proved
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