【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(dòng)詞時(shí)態(tài)與語(yǔ)態(tài)。prove意為“證明”，用“prove (to be) + 名詞/形容詞等”結(jié)構(gòu)時(shí)，它是系動(dòng)詞，和后面的成分構(gòu)成系表結(jié)構(gòu)，等同于turn out；而系動(dòng)詞是不能用于被動(dòng)語(yǔ)態(tài)的。根據(jù)句意用一般過(guò)去時(shí)態(tài)，故選C。

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