As time went by the theory he had stuck correct .A. to proveB. to provingC. to provedD.

问题补充：

As time went by , the theory he had stuck correct .

A. to prove

B. to proving

C. to proved

D. to be proved

答案：

A. to prove

B. to proving

(答案→)C. to proved

D. to be proved

解析：考查句子结构，he had stuck是从句修饰the theory，从句中缺少to，这句话的谓语是prove，表示“证明是”，相当于连系动词，后面接名词或形容词，不用被动，句意：随着时间的推移，他坚持的理论证明是对的。选C。