Whatever is left over may be put into the refrigerator, __________ it will keep for two or three weeks.
| A．when |
| B．which |
| C．where |
| D．while |
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Whatever is left over may be put into the refrigerator, __________ it will keep for two or three weeks.
| A．when |
| B．which |
| C．where |
| D．while |
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