The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
A．when　B．that
C．where　D．which
A
考查定語從句。句意：你在農(nóng)村可以呼吸新鮮無污染的空氣、喝到清潔無污染的水的日子已一去不復返了。此處是when引導的定語從句，修飾先行詞The days，when在從句中作時間狀語，故選A項。
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