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

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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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