he is going camping () 7:00 () the morning of july 27.A in,on B at,on

问题描述:

he is going camping () 7:00 () the morning of july 27.A in,on B at,on

he is going camping () 7:00 () the morning of july 27.A in,on B at,on
选B
at+具体钟点
on+具体日期为什么用at,in不是表示7:00之后吗?在七月27号的早上七点是这个意思in后面不加具体几点