题目
The days ______ you could travel without a passport are gone.
A) of which B) on which C) in which D) at which
第3题
The days _______ you could travel without a passport are a thing of the past.
A. in which
B. on which
C. of which
D. at which
第8题
A. miss
B. fail
C. fall
D. lose
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