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

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

出自：商丘师范学院-英语语法与语篇(高起专)

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