Talk to your teacher and you will get help ________ you have a problem.
A．unlessB．if
C．untilD．so
B

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(wèn)題，給你的老師說(shuō)說(shuō)，你就會(huì)得到幫助。故選B。
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