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

A.isB.areC.wereD.be

【答案】A

【解析】

句意:做眼保健操是保護(hù)眼睛的有效方法之一。

A. is是,單數(shù);B. are是,復(fù)數(shù);C. were是,過(guò)去式復(fù)數(shù);D. be原形。這里是動(dòng)名詞Doing eye exercises做主語(yǔ),這里是一般現(xiàn)在時(shí)態(tài),be動(dòng)詞用單數(shù)is。根據(jù)題意,故選A

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