The cause he had devoted himself ______ ...

The cause he had devoted himself ______ a perfect success.

A. to proved B. proved

C. to prove D. to proving

A 【解析】考查时态。句意：他投身的事业证明是相当成功的。devote oneself to表示“投身于”，The cause he had devoted himself to是一个定语从句，根据devoted判断此处用一般过去时，故A项正确。

考点分析：

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