问题
选择题
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
答案
答案：D
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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
答案：D