________ morning exercises is good for our

________ morning exercises is good for our
________ morning exercises is good for our health. a,did b,doing c,does d,do

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B、doing
其实to do和doing都可以的.不定时和动名词都可以做主语的.
区别在于：动名词做主语表示经常做的事情,而不定式做主语表示具体的,抽象的动作,一次性的.

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