【題目】Doing eye exercises ________ one of the useful ways to protect our eyes.
A.is
B.are
C.were
D.be

【答案】A
【解析】句意:做眼保健操可以很有效的保護(hù)眼睛。動(dòng)名詞做主語,謂語用三單,故選A。

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