题目内容
5.I have a tight budget for the trip,so I'm not going to fly the airlines lower ticket prices.( )A. | once | B. | if | C. | after | D. | unless |
分析 我旅行的预算很吃紧,所以不打算坐飞机,除非航空公司降低票价.
解答 答案D.
once"一旦",引导时间状语从句;if"如果",引导条件状语从句;after"在…之后",引导时间状语从句;unless"除非",引导条件状语从句.分析可知"I'm not going to fly"和"the airlines lower ticket prices"是逻辑上的"条件"关系,故排除A和C两项;而unless在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用.那么根据句子所表达的意思可排除B项,故答案选D.
点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.本题尤其要注意区分unless和if的用法.unless在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用.如:Unless I am mistaken,I've seen that man before.=If I am not mistaken,I've seen that man before.如果我没搞错,我以前见过那个人.
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