题文
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 |
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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 |
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