题目内容
16．You can ask the policeman for help ________ you know the way．（ ）| A． | though | B． | if | C． | unless | D． | until |
分析 如果你不知道路的话，你可以向警察求助．
解答 答案：C．
本题考查的是从属连词的辨析．根据语境推测句意是"如果你不知道路的话，你可以向警察求助．"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C．
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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