()morning exercises is good ()you.a:doing,for.b:do,for.c:doing,on.d:do,at.

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()morning exercises is good ()you.a:doing,for.b:do,for.c:doing,on.d:do,at.
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()morning exercises is good ()you.a:doing,for.b:do,for.c:doing,on.d:do,at.
()morning exercises is good ()you.a:doing,for.b:do,for.c:doing,on.d:do,at.

()morning exercises is good ()you.a:doing,for.b:do,for.c:doing,on.d:do,at.
A Doing , for
动名词作主语, be good for 固定词组‘对……有益’

A
动名词做主语,good for 对...有好处

选A doing 和for

答案A。前面一个空考察动名词作主语。其中,Do+ing构成动名词形式,词性为名词,此句中放在句首,作主语成分。后面一个空考察固定搭配be good for+somebody词组,you这里替换了somebody的位置,所以对照起来应填入介词for。
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