2. 外语
  3. The days whenever you ______ (travel) without a passport are a thing of the past.

The days whenever you ______ (travel) without a passport are a thing of the past.

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问题 The days whenever you ______ (travel) without a passport are a thing of the past.
选项
答案could travel
解析 句意：没有护照就可以旅行已经成为了过去。“the days”实际上隐含有过去的概念，所以，call要变成could。
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