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【题目】—May I surf the Internet now?
—No, _____ you have finished washing the dishes.
A.if
B.unless
C.because
D.when

【答案】B
【解析】句意:—我现在可以上网吗?—不,除非你洗完这些盘子。A. if 如果;B. unless除非;C. because因为;D. when当……时候。根据句意及题干分析此题应选B。

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