( )crime in this area has increased so much over the last 20 years?

( )crime in this area has increased so much over the last 20 years?
A.Why is it that B.Why it is that C.Why was it that D.Why it was that
该题正确答案应选A,说明其他几项为什么不对,
英语人气:532 ℃时间:2019-11-02 08:12:37
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陈述语序:It is why that...
可以用类比:it is i that open the door====> who is it that..
强调句型 it be ..+ that
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