问题

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
B:since; 不填
C:when; that
D:since; that
正确答案是:
同类题型
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