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一道令我费解的英语选择题The days__you could travel without a passport are gone.A of which B at which 我感觉应该选A啊 但答案为啥是B呢

题目详情
一道令我费解的英语选择题
The days__you could travel without a passport are gone.
A of which B at which
我感觉应该选A啊 但答案为啥是B呢
▼优质解答
答案和解析
显然选b啊
you could travel without a passport at(此处注意) weekends(相当于days)