_____________walking after supper for over half an hour does good to people's health?A.Why is it that B.Why was it that C.Why is it D.Why it is that .这道选什么呢,为什么?还有句子后面的does是不是起强调作用?

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_____________walking after supper for over half an hour does good to people's health?A.Why is it that B.Why was it that C.Why is it D.Why it is that .这道选什么呢,为什么?还有句子后面的does是不是起强调作用?