Question

【题目】—Why was Professor Smith unhappy recently?

—Because the theory he stuck to ________ wrong.

A. provesB. was provedC. proved D. proving

Answer 1

【答案】C

【解析】

试题分析：考查动词时态与语态。prove意为“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。