【題目】I have a tight budget for the trip, so I'm not going to flythe airlines lower ticket prices.
A.once
B.if
C.after
D.unless

【答案】D
【解析】句意：我旅行的預(yù)算很吃緊，所以不打算坐飛機，除非航空公司降低票價。unless相當(dāng)于if...not，，根據(jù)句意，選D。

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