_______ 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,沒有復(fù)數(shù)形式。be good for對……有好處;利于。此處作主語,故用動名詞短語,動名詞短語做主語,謂語用單數(shù)形式。故選B。
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