All made possible for China to succeed in carrying on its reforms and open-door policy.A.

问题补充：

All made possible for China to succeed in carrying on its reforms and open-door policy.

A. what happened; it

B. what happened; that

C. that happened; it

D. that happened; that

答案：

A. what happened; it

B. what happened; that

(答案→)C. that happened; it

D. that happened; that

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