I have a tight budget for the trip.so I'm not going to fly the airlines lower ticket prices．( )A．onceB．ifC．afterD．unless 题目和参考答案——青夏教育精英家教网——

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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