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 plantB．to plantingC．plantD．planting
B

試題分析：句意為：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被認為是值得的。短語devote sth to sth 中to的詞性是介詞，故to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.所以答案應為B。
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