问题描述：
1.Occasions are quite rare ___ I have the time to spend a day with my kids.为什么...
1.Occasions are quite rare ___ I have the time to spend a day with my kids.为什么用when不用which?
1.Occasions are quite rare ___ I have the time to spend a day with my kids.为什么用when不用which?
问题解答：
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