A
It's difficult to get to a specific place, such as an office, a café, a bar, etc.
B
The last mile before reaching the destination.
C
The doctor's office is always a mile away from where the blind live.
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What does the underlined phrase “last mile problem” in Para. 7 mean?
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再进一步，找到解题思路
解锁参考答案与解析，已解锁内容可反复查看。