题目内容

He has proved his courage in the battle.
Through tests time and time again, this kind of rope____strong.
A.was provedB.has ben turned outC.turnedD.proved
D
考查系动词用法。句意:通过一次次实验,结果证明这种绳子是结实的。turn out,prove作为证明是,结果是,原来是为系动词,无被动语态。
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