Talk to your teacher and you will get help ________ you have a problem.

A．unlessB．if
C．untilD．so

B

解析試題分析：unless除非，如果不； if是否，如果；until直到；So因此。句意：如果你有問題，給你的老師說說，你就會得到幫助。故選B。
考點(diǎn)：考查連詞辨析

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