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You won't work out the problem ______ you understand it. So listen to me explain now.

A.sinceB.when
C.unlessD.though

C

解析试题分析:句意:除非你理解了这道题,你不会做出它的。所以现在听我讲解。since自从,when
当……的时候,unless除非, though尽管。根据语境可知是如果不明白就无法解答这道题,故选C.
考点:考查连词辨析

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