No one will be admitted to the briefing room during Ms. Palmer’s speech, so it is important that you arrive prior ______ the sch

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问题 No one will be admitted to the briefing room during Ms. Palmer’s speech, so it is important that you arrive prior ______ the scheduled start time of 3:30.

选项 A、to
B、than
C、from
D、at

答案A

解析 表时间介词prior to(在……之前)
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