题目内容

---May I surf the Internet now?
---No,______ you have finished doing the dishes.
A．unless.B．if.C．because.D．when
A
考查连词：A.unless除非B.if.如果C.because因为D.when当…时候，根据句子的意思：--我现在可以上网吗？--不，除非你洗完碗。选择A，表示除非相当于if ···not，条件状语从句，故选A
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