题文
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 |
推荐试卷
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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