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 plantingB.to plantC.plantD.planting
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A解析考查动名词，此句的主语是The time and effort，谓语是is considered，而he has devoted during the past few years to planting trees是句子的定语从句，其谓语动词使用了devote…to doing结构，故A项正确。