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我每天在书桌上做作业,是用on还是用atIdomyhomeworkon\atthedeskeveryday.我每天在书桌上做作业,是用on还是用atIdomyhomeworkon\atthedeskeveryday.在书架上用onthebookcase还是用inthebookcase?

题目详情
我每天在书桌上做作业,是用on还是用at I do my homework on \ at the desk every day.
我每天在书桌上做作业,是用on还是用at
I do my homework on \ at the desk every day.
在书架上用on the bookcase 还是用in the bookcase?
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答案和解析
I do my homework at the desk.
on the bookcase