问题
选择题
We have breakfast _____ 6:30 _____ the morning. [ ]
A. at; on
B. at; in
C. in; on
答案
答案：B
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We have breakfast _____ 6:30 _____ the morning. [ ]
A. at; on
B. at; in
C. in; on
答案：B
则犯第一类错误的概率为( )