题目内容
18．-You won't join us in this school trip，will you？-Yes， invited．（ ）
| A． | though | B． | if | C． | unless | D． | as |
分析 --你不会参加这次学校旅行，是吗？
--是的，除非（我）受到邀请．
解答 答案：C．
本题考查的是从属连词的辨析．根据问句"你不会参加这次学校旅行，是吗？"推测答语是"是的，除非（我）受到邀请．"，这里需要一个表假设的连词，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 联系前后语境，在准确把握前后句关系的基础上，先推测出大体句意；再结合关键词利用其固定用法选出正确答案．
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