they stop playing computer games.they won't make great progress．( )A．IfB．UntilC．UnlessD．So 题目和参考答案——青夏教育精英家教网—

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19． they stop playing computer games，they won't make great progress．（　　）

A．

B．

Until

C．

Unless

D．

分析除非他们停止玩电脑游戏，否则他们不会取得很大进步．

解答答案：C；
If如果；Until直到；Unless除非；So于是；根据句意，"they stop playing computer games他们停止玩电脑游戏"是"they won't make great progress他们不会取得很大进步"的条件，而且是否定的条件；Unless引导条件状语从句，Unless=if not；故选C．

点评连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键．

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