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The doctor when he joined the ANC Youth League was August 5t

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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 5t
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
再问: 那为什么不用on which?