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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

解析試題分析:句意:除非你理解了這道題,你不會做出它的。所以現在聽我講解。since自從,when
當……的時候,unless除非, though盡管。根據語境可知是如果不明白就無法解答這道題,故選C.
考點:考查連詞辨析

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