I have a tight budget for the trip, so I'm not going to fly ________ the airlines lower ticket

题目简介

I have a tight budget for the trip, so I'm not going to fly ________ the airlines lower ticket

题目详情

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
题型:单选题难度:中档来源:专项题

答案

D

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