As time went by, the plan he stuck fairly practical.
A. to proved
B. to proving
C. proved
D. to be proved
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(答案→)A. to proved
B. to proving
C. proved
D. to be proved
解析：考查词组和prove的用法：句意：随着时间的推移，他一向坚持的计划被证实相当实用。Stick to坚持，the plan意思上是stuck to 的宾语，即stuck to the plan。He stuck to 作 the plan 的定语从句，表示一向坚持的计划，prove在这里是证明是;结果是;事实说明的意思,用作连系动词,主动表被动，选A。