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【题目】The research that he has devoted himself to _______ the farmers have a better harvest.

A.helpingB.to helpC.helpD.helps

【答案】D

【解析】

句意:他所潜心做的研究帮助农民获得更好的收成。

考查时态。A. helping动名词、现在分词; B. to help不定式;C. help原形;D. helps一般现在时、单三形式;陈述现阶段的事情,判断句子是一般现在时;主语the research是单数第三人称,谓语动词+s/es;故选D

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