Thetimeandefforthehasdevotedduringthepastfewyears　　　　tr...

问题详情：

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．to planting       B．to plant       C．plant          D．planting

【回答】

知识点：固定句型

题型：选择题