_____________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?

_____________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?
_____________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?

_____________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?
本题该选 A
这是一个强调结构,被强调部份是原因状语.句子的主语是动名词短语,故谓语动词要用单数,即 does.( do good to ).
句意：晚饭后散步半个小时为什么会对人们的健康有好处呢?

选A Why is it that
why is it 是主句，it 是形式主语
后面都是从句，是真正的主语
does 是谓语动词，不是单独用来起强调左右的

A.答案是A。 首先这是个it is ....that..强调句的特殊疑问句。
后面的does 是固定搭配， do good to ...对什么有好处。