2. 外语
  3. Perhaps the day will come______people will be able to breathe clean air in cities.

Perhaps the day will come______people will be able to breathe clean air in cities.

admin2018-01-16  42
问题 Perhaps the day will come______people will be able to breathe clean air in cities.
选项 A、when
B、while
C、as
D、since
答案A
解析 本题考查定语从句的用法。when引导定语从句修饰the day，因为在定语从句中缺少时间状语，所以用when。
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