It is 30 years China performed the Reform and Opening-up policy has had a great effect n

问题补充：

It is 30 years China performed the Reform and Opening-up policy has had a great effect not just on China, but also on the world.

A. that; since

B. since; 不填

C. when; that

D. since; that

答案：

A. that; since

B. since; 不填

C. when; that

(答案→)D. since; that

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