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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