（） exercise at least twice a week can help you （）A.do ,to stay healthy B.doing ,stay healthC.do,stay healthy D.doing ,to stay healthy选哪个?说明一下理由,

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（） exercise at least twice a week can help you （）A.do ,to stay healthy B.doing ,stay healthC.do,stay healthy D.doing ,to stay healthy选哪个?说明一下理由,
（） exercise at least twice a week can help you （）
A.do ,to stay healthy B.doing ,stay health
C.do,stay healthy D.doing ,to stay healthy
选哪个?说明一下理由,

（） exercise at least twice a week can help you （）A.do ,to stay healthy B.doing ,stay healthC.do,stay healthy D.doing ,to stay healthy选哪个?说明一下理由,
D,动名词作主语.healthy是形容词,stay后跟形容词

D

选D
因为do exercise 是主语，所以用ing形式，即doing。
stay……等同于keep……
意思是保持……
stay(keep)+形容词
意思是保持……的状态
而health 意为健康为名词
healthy 意为健康的
为形容词
所以选healthy
至于help 的用法是
help (to)...

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选D
因为do exercise 是主语，所以用ing形式，即doing。
stay……等同于keep……
意思是保持……
stay(keep)+形容词
意思是保持……的状态
而health 意为健康为名词
healthy 意为健康的
为形容词
所以选healthy
至于help 的用法是
help (to) do something
可以加to 也可以不加
所以符合以上几点的只有D

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