【題目】—Why did they start the club? —The main reason was ________ protect animals.

A. help B. helps C. helped D. to help

【答案】D

【解析】句意:——他們?yōu)槭裁撮_始這個俱樂部?——主要原因是幫助保護(hù)動物。 help用于一般現(xiàn)在時態(tài),主語是復(fù)數(shù)時,作謂語;helps用于一般現(xiàn)在時態(tài),主語是單數(shù)時,作謂語;helped用于一般過去時態(tài),作謂語;這里有系動詞was,不需要謂語,這里用不定式做表語;故選D

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