The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.

A．plant

B．planting

C．to plant

D．to planting

 

【答案】

D

【解析】考查固定短語(yǔ)。Devote some time to sth/doing sth花費(fèi)時(shí)間做某事；

 

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