题目内容
20．I won't go to tomorrow's party_____ I am invited．（ ）| A． | if | B． | unless | C． | When |
分析 除非我被邀请，否则我不会去明天的聚会．
解答 答案：B if是否，如果；unless除非，如果不；When当…时．根据句中的关键词won't可知主句是否定句，和后面的I am invited构成一种表条件的假设关系，意为除非在我被邀请的情况下我才会去参加聚会，否则是不会去的．结合选项只有unless有此意义，故选B．
点评 此题考查连词的辨析．做此类题一定要根据前后主从句的意义判断出其关系；再结合选项根据连词的意义选择出符合句意的连词连接起来即可．
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