题目内容
12．______ you have tried it，you can't imagine how pleasant it is．（ ）| A． | Unless | B． | Because | C． | If | D． | When |
分析 如果你没有尝试过，你就无法想象这件事多么令人开心．
解答 答案：A．
本题考查的是从属连词的辨析．根据语境推测句意是"如果你没有尝试过，你就无法想象这件事多么令人开心．"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A．
点评 本题主要考查连词的用法，做此类题目一定要弄清句意，明白上下文之间的关系，比较和分析选项中连词的不同含义及其用法才能更好地判断出所要用的连词．
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