【題目】—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】

試題分析：考查動詞時態(tài)與語態(tài)。prove意為“證明”，用“prove (to be) + 名詞/形容詞等”結(jié)構(gòu)時，它是系動詞，和后面的成分構(gòu)成系表結(jié)構(gòu)，等同于turn out；而系動詞是不能用于被動語態(tài)的。根據(jù)句意用一般過去時態(tài)，故選C。

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