2. 专升本
  3. Perhaps the days will come ______people will be able to breathe clean air in cities.

Perhaps the days will come ______people will be able to breathe clean air in cities.

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问题 Perhaps the days will come ______people will be able to breathe clean air in cities.
选项 A、when
B、as
C、while
D、since
答案A
解析
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