题目内容

【题目】—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：——他们为什么开始这个俱乐部？——主要原因是帮助保护动物。 help用于一般现在时态，主语是复数时，作谓语；helps用于一般现在时态，主语是单数时，作谓语；helped用于一般过去时态，作谓语；这里有系动词was，不需要谓语，这里用不定式做表语；故选D

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