They were invited to an important ball ______ the first time in their life.A、for

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问题 They were invited to an important ball ______ the first time in their life.

选项 A、for
B、at
C、on

答案 A

解析 at后加时间，是指确切的时间，例如at 2:30；on加时间指的是一天中的某段时间或者具体的时间，例如on Friday evening。

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