Ihaveatightbudgetforthetrip，so

更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 635

挑错有奖

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

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