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

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

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

试题答案

D