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

試題分析：prove="turn" out 證明，結果是；可以作為系動詞，后接形容詞作表語，無被動形式。題目中用的一般過去時，故選D.句意：當我們有客人時，這個房子被證明是很有用的。
點評：諸如turn,get,go,become,stay,prove等系動詞的用法，要在平時的學習注意積累。go強調是由好變壞，turn強調顏色的變化等。對于此類系動詞無被動，一般也無進行時態(tài)形式（除becoming外）。
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