问题
选择题
The extra room _______ very useful when we had visitors.
A．was proved
B．proved
C．has been proved
D．has proved
答案
答案：B
系动词用法。系动词prove是没有被动语态的。“Prove +形容词”构成系表结构。
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The extra room _______ very useful when we had visitors.
A．was proved
B．proved
C．has been proved
D．has proved
答案：B
系动词用法。系动词prove是没有被动语态的。“Prove +形容词”构成系表结构。