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__________ you understand the rule, you will have no further difficulty.

A.While B.Once
C.Though D.Unless

B

解析试题分析:A. While当…时候,虽然,然而,B. Once一旦, C. Though虽然,D. Unless除非,句意:一旦你理解了规则,你就不会有困难了。根据句意选B。
考点:考查连词

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