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3.We are going to the theater tomorrow ______ all the tickets are sold out.(  )
A.whenB.unlessC.whetherD.because

分析 如果所有的票还没有都被卖光,那我们明天去看戏剧吧.

解答 答案选B.
When当…时候,引导时间状语从句;unless除非(在意义上相当于if…not),引导条件状语从句;whether不管,引导让步状语从句;because因为,引导原因状语从句.根据主从句之间的逻辑关系来判断,应该是一种条件关系,故答案选B.

点评 考查状语从句中从属连词的用法辨析.连词的用法辨析,要注意分析主从句之间的关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.本题尤其要注意区分unless和if的用法.unless在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用.

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