The doctor when he joined the ANC Youth League was August 5th.为什么只能用when,为什么不能用at which?应该是date,不是doctor,打错了。

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The doctor when he joined the ANC Youth League was August 5th.为什么只能用when,为什么不能用at which?应该是date,不是doctor,打错了。

The doctor when he joined the ANC Youth League was August 5th.为什么只能用when,为什么不能用at which?应该是date,不是doctor,打错了。
The doctor when he joined the ANC Youth League was August 5th.
为什么只能用when,为什么不能用at which?
应该是date,不是doctor,打错了。

The doctor when he joined the ANC Youth League was August 5th.为什么只能用when,为什么不能用at which?应该是date,不是doctor,打错了。
因为后面是日期啊.AT是时间点时才用,具体某一天不跟AT搭配,而跟ON搭配

因为句子中没有缺失部分,所以不用at which

这个句子好像有些问题,把when引导的从句“when he joined the ANC Youth League”单独提出来,剩下的主句就变成了“The doctor was August”,存在逻辑问题。
可以改为The time when he joined the ANC Youth League was August 5th. 这个句子才是定语从句
只有在定语从句的范围内...

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这个句子好像有些问题,把when引导的从句“when he joined the ANC Youth League”单独提出来,剩下的主句就变成了“The doctor was August”,存在逻辑问题。
可以改为The time when he joined the ANC Youth League was August 5th. 这个句子才是定语从句
只有在定语从句的范围内才能讨论when和at which的区别
when和at which引导的都是先行词在句中作时间状语的定语从句,用when肯定可以,那样就不用考虑介词,如果用at which,把先行词代进从句就变成了“” he joined the ANC Youth League at the time",这样就不行了。

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