Perhaps the day will come________people will be able to breathe clean air in cit

游客2024-01-14 40

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

解析句意：可能人们在城市里能够呼吸清新空气的日子会到来的。先行词是day，在定语从句中作时间状语，用关系副词when，故选A。

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