It is strongly advised that you check that you have all your essential documents in a briefcase______you set out on an internati

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问题 It is strongly advised that you check that you have all your essential documents in a briefcase______you set out on an international trip.

选项 A、upon
B、before
C、beside
D、next to

答案B

解析横线前后都是完整的结构，因此横线处需填入连词。答案是(B)before，其余选项均为介词。

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