The time and effort he has devoted during the past few years trees in that village are no

问题补充：

The time and effort he has devoted during the past few years trees in that village are now considered to be very important.

A. to planting

B. to plant

C. plant

D. planting

答案：

(答案→)A. to planting

B. to plant

C. plant

D. planting

解析：考查短语devote…to “致力于”，to为介词后接动词ing形式。所以选A。