【題目】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:他所潛心做的研究幫助農(nóng)民獲得更好的收成。

考查時(shí)態(tài)。A. helping動(dòng)名詞、現(xiàn)在分詞; B. to help不定式;C. help原形;D. helps一般現(xiàn)在時(shí)、單三形式;陳述現(xiàn)階段的事情,判斷句子是一般現(xiàn)在時(shí);主語(yǔ)the research是單數(shù)第三人稱(chēng),謂語(yǔ)動(dòng)詞+s/es;故選D。

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