I went to Beijing by train the first time When I was 28.选at or forI went to Beijing by train ————the first time When I was 28.

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IwenttoBeijingbytrainthefirsttimeWhenIwas28.选atorforIwenttoBeijingbytrain————thefirsttimeWhenIwas28.

I went to Beijing by train the first time When I was 28.选at or forI went to Beijing by train ————the first time When I was 28.
I went to Beijing by train the first time When I was 28.
选at or for
I went to Beijing by train ————the first time When I was 28.

I went to Beijing by train the first time When I was 28.选at or forI went to Beijing by train ————the first time When I was 28.
for the first time 首次;第一次
at the first time 第一时间
所以
选for
就是说,我第一次乘火车去北京是28岁得时候

for

for the first time 首次;第一次
at the first time 第一时间

for 吧!
for the first time是固定的