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单选题成人英语三级

2026-09-06

Perhaps the day will come __________ people will be able to breathe clean air in cities．

A．when

B．while

C．as

D．since

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参考答案

A

答案解析

【参考译文】可能人们在城市里能呼吸新鲜空气的日子就要到了。
【答案解析】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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