_______ good for our health.
A.Do exercise isB.Doing exercise is C.Do exercises areD.Doing exercises are
B

試題分析:句意:做鍛煉有利于我們的健康。do exercise做鍛煉,exercise當(dāng)鍛煉時(shí),是不可數(shù)名詞,沒(méi)有復(fù)數(shù)形式。be good for對(duì)……有好處;利于。此處作主語(yǔ),故用動(dòng)名詞短語(yǔ),動(dòng)名詞短語(yǔ)做主語(yǔ),謂語(yǔ)用單數(shù)形式。故選B。
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