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

游客2024-01-14  7

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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