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【题目】—Why was Professor Smith unhappy recently?

—Because the theory he stuck to ________ wrong.

A. provesB. was provedC. proved D. proving

【答案】C

【解析】

试题分析:考查动词时态语态。prove意证明,用“prove (to be) + 名词/形容词等”结构时它是系动词和后面的成分构成系表结构等同于turn out而系动词是不能用于被动语态的根据句意用一般过去时态,故选C。

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