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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(xiàn)在聽我講解。since自從，when
當……的時候，unless除非， though盡管。根據(jù)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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