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

A.isB.areC.wereD.be

【答案】A

【解析】

句意:做眼保健操是保护眼睛的有效方法之一。

A. is是,单数;B. are是,复数;C. were是,过去式复数;D. be原形。这里是动名词Doing eye exercises做主语,这里是一般现在时态,be动词用单数is。根据题意,故选A

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