题目内容
6．-May I go to the concert with you？-I'm afraid not ____ you have a ticket，because I have only one．（ ）
| A． | since | B． | if | C． | unless | D． | though |
分析 --我可以和你一块去参加音乐会吗？
--恐怕不能，除非你有票，因为我只有一张票．
解答 答案：C since意为"自从…以来"引导时间状语从句；if意为"如果"引导条件状语从句；unless意为"除非"引导条件状语从句；though意为"即使，尽管"引导让步状语从句．根据"I'm afraid not ____ you have a ticket"可知除非有票才能参加音乐会，所以要用unless，故选C．
点评 首先要掌握since，if，unless，though这四个连词的意思及用法，然后结合具体的题意做出正确选择．
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