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The room _______ very useful when we had visitors.
A.was provedB.has been proved
C.has provedD.proved
D

试题分析:prove="turn" out 证明,结果是;可以作为系动词,后接形容词作表语,无被动形式。题目中用的一般过去时,故选D.句意:当我们有客人时,这个房子被证明是很有用的。
点评:诸如turn,get,go,become,stay,prove等系动词的用法,要在平时的学习注意积累。go强调是由好变坏,turn强调颜色的变化等。对于此类系动词无被动,一般也无进行时态形式(除becoming外)。
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