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It is 30 years ______ China performed the Reform and Opening-up policy ______ has had a great effect...
题目内容：
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.
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A．that; since |
B．since; 不填 |
C．when; that |
D．since; that |
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