Thetimeandefforthehasdevotedduringthepastfewyears　　　　tr...

問題詳情：

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】

知識點：固定句型

題型：選擇題