The days______you could travel without a passport are a thing of the past.

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问题 The days______you could travel without a passport are a thing of the past.

选项 A、in which
B、on which
C、of which
D、at which

答案A

解析 选项中的which引导后边的you could travel without a passport修饰the days,同时,the days表示是一段时间所以which前加介词in构成从句的状语。
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