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?

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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?
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?

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?
when 在这里是引导词 是关系副词 因为你后面的it is Sunday是一个从句 既然这里是句子就需要引导词 而后面的是表示时间的 所以就用when 而1差when这个引导词