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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