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

A．onceB．ifC．a(chǎn)fterD．unless

D

解析試題分析：本題考查時間狀語從句以及連接詞的意義，句意：我這次旅行預算很緊，所以除非航空公司降低機票價格，否則我是不會乘坐飛機的，所以答案為D。
考點：考查時間狀語從句以及連接詞
點評：這幾個連詞的意思完全不同，結合句意就可以做出，學生可能會因為句子意義沒有看懂或者對連接詞的意義混淆而選錯。 ~

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