You can't get good grades you study harder than before．( )A．ifB．unlessC．whenD．so 题目和参考答案——青夏教育精英家教网—

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12．You can't get good grades _____ you study harder than before．（　　）

A．

B．

unless

C．

when

D．

分析除非你比以前更加努力学习，否则你不会取得好成绩的．

解答答案：B．
本题考查的是从属连词的辨析．根据语境推测句意是"除非你比以前更加努力学习，否则你不会取得好成绩的．"从句意来看，这里需要一个表假设的连词，说明后句是表假设的条件状语从句，结合选项，unless可以引导一个表假设的条件状语从句，意为"除非"，相当于if not．故选B．

点评本题主要考查连词的用法，连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词．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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