I have a tight budget for the trip,so I'm not going to fly the airlines lower ticket prices.(2012·上海,32)
A. once
B. if
C. after
D. unless
网友回答
A. once
B. if
C. after
(答案→)D. unless
解析:句意: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。考查状语从句。unless相当于if...not,符合前后句的逻辑。