Perhaps the day will come ____ people will be able to breathe clean air in cities．
A．whenB．whileC．a(chǎn)sD．since
A

這道題考查定語從句的用法：when引導定語從句修飾the day，因為在定語從句中缺少時間狀語，所以用when。句意是：可能人們在城市里能呼吸新鮮空氣的日子就到了。
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