Mrs Black had such a wonderful time___she visited her friend

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Mrs Black had such a wonderful time___she visited her friends in Sydeny last year.
请问为什么用when不用as?

when 引导限制性的后置定语从句,而as 只可以引导非限制性定语从句,如： As is reported/ said that.等等.
she visited her friends in Sydeny last year都是做wonderful time的后置定语从句.所以,这里只可以用when.
望采纳,祝开心~!
再问：谢谢你

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