问题描述：
She has always been busy () it is Sunday.
1.except 2.except for 3.except that 4.except when
为什么一定要加一个when 1为什么不行?
1.except 2.except for 3.except that 4.except when
为什么一定要加一个when 1为什么不行?
问题解答：
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