--Shall Mary come and play computer games?
--No,__________ she has finished her homework.
A．whenB．ifC．unlessD．once
C
本題只要理解了句意就能很容易地選出unless。句意為：“瑪麗要來打電腦游戲嗎?”“不，除非她完成了作業(yè)�！�
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