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【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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