B. at
C. onB
考点：介词。
解析：
in,on,at都是可以表示时间的介词。in表示较长时间，on表示具体某一天及早中晚，at表示某一时刻或较短的时间，结合语境此题应该选B选项。
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I usually have breakfast 8:00. [ ]A. in B. at C. on
编辑：chaxungu时间：2026-04-23 21:49:12分类：小学英语题库
I usually have breakfast _______8:00.[ ]A. in
B. at
C. onB
B. at
C. onB
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