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【题目】 Doing eye exercises one of the useful ways to protect our eyes.

A. is B. are C. were

【答案】A

【解析】

试题分析:句意:做眼保健操是保护眼睛的有效方法之一。is是,适用于第三人称单数;are是,适用于第二人称单数和所有的复数;were是,是are的过去式。本句主语Doing eye exercises是动名词短语,谓语动词该用第三人称单数形式,所以选A

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