I wonderthere are so many natural disasters across the world in .A. which it is thatB.

问题补充：

I wonderthere are so many natural disasters across the world in .

A. which it is that

B. what is it that

C. how it is that

D. why it is that

答案：

A. which it is that

B. what is it that

C. how it is that

(答案→)D. why it is that

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