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．onceB．ifC．a(chǎn)fterD．unless
D
句意：我旅行的預(yù)算很吃緊，所以不打算坐飛機(jī)，除非航空公司降低票價(jià)�？疾闋钫Z從句。unless相當(dāng)于if...not，符合前后句的邏輯。
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