If you want to be healthy,()is().A.do more exercise;helpingB.do more exercise;helpfulC.doing more exercise;helpfulD.doing more exercise;helping

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If you want to be healthy,()is().A.do more exercise;helpingB.do more exercise;helpfulC.doing more exercise;helpfulD.doing more exercise;helping

If you want to be healthy,()is().A.do more exercise;helpingB.do more exercise;helpfulC.doing more exercise;helpfulD.doing more exercise;helping
If you want to be healthy,()is().
A.do more exercise;helping
B.do more exercise;helpful
C.doing more exercise;helpful
D.doing more exercise;helping

If you want to be healthy,()is().A.do more exercise;helpingB.do more exercise;helpfulC.doing more exercise;helpfulD.doing more exercise;helping
C选项应该是正确的
doing more exercise 是动名词,作为后面一句的主语
helpful是形容词,接在Be 动词之后.