Question

【题目】

The theory he had stuck ______ to be true.

A. proved

B. to proving

C. to prove

D. to proved

Answer 1

【答案】D

【解析】 he had stuck to是省略了关系代词的定语从句，修饰theory，stick to（坚持）为固定搭配；去掉这个定语从句后，我们可以很清楚地发现整个句子缺少谓语动词，定语从句时态为过去完成时，所以主句谓语动词应该用过去式。