—Coach，can I continue with the training?
—Sorry，you can’t________you haven’t recovered from the knee injury.(2012·重慶，30)
A．untilB．before
C．a(chǎn)sD．unless
C
解析　句意為：——教練，我可以繼續(xù)訓(xùn)練嗎？——抱歉，你不能，因為你膝蓋傷還沒有恢復(fù)。分析題意可知前后兩句有明顯的因果關(guān)系，故選as表原因。而until，before和unless都需后句用肯定才可與前句的you can’t相符合。
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