to stay with sb. longer than they want you to (词组)
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to visit sb. when you have not arranged to come at a particular time （词组）
a rule you use for doing or explaining things that is based on experience （词组）
在航班延误班次多、时间长的情况下，广播室工作人员不少于 人，问讯处人员不少于人。
A. 2、3
B. 4、6
C. 1、2
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