As time went by the plan he stuck fairly practical. A. to provedB. to provingC. provedD.

问题补充：

As time went by, the plan he stuck fairly practical.

A. to proved

B. to proving

C. proved

D. to be proved

答案：

(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。