I eat lunch ______A.at school B.in school 说明下为什么

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I eat lunch ______A.at school B.in school 说明下为什么
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I eat lunch ______A.at school B.in school 说明下为什么
I eat lunch ______
A.at school B.in school
说明下为什么

I eat lunch ______A.at school B.in school 说明下为什么
A.at school是固定词组.

A 好像都这么用,具体原因不明

at school 在学校(干什么)
而in school式方位词,如说I am in school,在学校里

at school,因为要用in ,就得用in the school