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20.--Do the factory board members meet every Monday morning?
--Yes,________ there is nothing important to deal with.(  )
A.sinceB.ifC.unlessD.once

分析 --这家工厂董事会的成员每周一早晨都开会吗?
--是的.除非没有重要的事情讨论,否则每周一早晨都开会.

解答 答案:C.
分析上下两个句子的意思可知,划线处后面的句子为一个特例,除此之外都开会,所以用unless表示"除…之外";故选C.

点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,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.

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