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After the operation, the first thing he does every morning i

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After the operation, the first thing he does every morning is _____ plenty of exercise.
A. to take B. taking C. take D. to be taken
选哪个?为什么?
答案是C,我选B,为什么不能是B?
After the operation, the first thing he does every morning i
选C.没错.你记住哦,如果前面有“do”,后面就选动词原形.如果前面没有“do”则选to do.