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

试题分析:句意:做锻炼有利于我们的健康。do exercise做锻炼,exercise当锻炼时,是不可数名词,没有复数形式。be good for对……有好处;利于。此处作主语,故用动名词短语,动名词短语做主语,谓语用单数形式。故选B。
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