I think you probably know China has adopted a flexible policy （） her foreign trade.

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I think you probably know China has adopted a flexible policy （） her foreign trade.
A.on
B.with
C.in
D.under

本题关键词:肛I,石I鱼,因子I,I因子,I导联,I度烧伤,I类抗原,I期愈合,I类分子,I类环境;