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题目内容
（商丘师范学院- 英语语法与语篇）
(单选题) The days ____ you could travel without a passport are a thing of the past.
(本题1.0分)
A、 in which
B、 on which
C、 of which
D、 at which
(本题1.0分)
A、 in which
B、 on which
C、 of which
D、 at which
参考答案