when did he come/came to our school?About half an four ago.选come还是came

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when did he come/came to our school?About half an four ago.选come还是came
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when did he come/came to our school?About half an four ago.选come还是came
when did he come/came to our school?About half an four ago.选come还是came

when did he come/came to our school?About half an four ago.选come还是came
选 come
因为did已经是过去式了,后面的动词用原形

do+动词原形
或者did+动词原形
选come

come ,因为是疑问句,did作为助动词 表示了过去式,come就应该使用原形