Seats can be selected________when you book your flight or at any time up to 24 hours of the flight.

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问题 Seats can be selected________when you book your flight or at any time up to 24 hours of the flight.

选项 A、on purpose
B、in advance
C、on board
D、in detail

答案B

解析 本题考查介词短语辨析。空格前提到座位可以被选,空格后提到当你在订机票的时候或航班起飞前24小时内选择。也就是说,座位是可以提前选择的,in advance意为“提前”,符合句意,因此本题答案为B项。介词短语on purpose意为“有意地,故意地”,on board意为“在船上,在飞机上”,in detail意为“详细地”,这三个选项都不符合句意,因此均可以排除。
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