Business class passengers will receive a 30 percent discount for purchasing tickets______least three months in advance.

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问题 Business class passengers will receive a 30 percent discount for purchasing tickets______least three months in advance.

选项 A、at
B、ln
C、of
D、if

答案A

解析 空格后是名词词组,因此空格中应当是介词,因此首先排除连词if。空格后的least是解决问题的线索,at least意为“最少,至少”,是一个常用的词组,因此答案是(A)项。
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