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

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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。