25. Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．A．to openB．opene-高中英语-n多题

◎ 题干

25. Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．

A．to open

B．opened

C．opening

D．having opened

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◎ 解析

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◎ 知识点

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