15. 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 plant      B.  to planting

C. plant         D. planting

15.   B 4查非謂語動詞。句意：他在過去的這些年里在那個偏遠的地區(qū)種樹所付出的時間和精力現(xiàn)在被認為是很值得的。短語devote sth to sth中to是介詞，故lo之后應為名詞或動名詞形式。此處表示把時間和精力花費在了種樹上，所以應為devote time and effort to planting trees。 故選B。

題目來源：2015全品語法快練高中英語新課標 > 訓練22非謂語動詞和獨立主格

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