makes a scientific achievement important?A. It is what thatB. Is it that whatC. What is i

问题补充：

makes a scientific achievement important?

A. It is what that

B. Is it that what

C. What is it that

D. What it is that

答案：

A. It is what that

B. Is it that what

(答案→)C. What is it that

D. What it is that

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