He devoted as much time as he could on the plan.A. workingB. to workC. workedD. to workin

问题补充：

He devoted as much time as he could on the plan.

A. working

B. to work

C. worked

D. to working

答案：

A. working

B. to work

C. worked

(答案→)D. to working

解析：句意：他把尽可能多的时间用在计划上。Devote… to把...献给，是一个固定用法，这儿的to是介词。所以选D。