Question

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

Answer 1

【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。