题干
Believe it or not, Levy’s sister suddenly ___________crying when we ere eating.
A：burst out
B：burst i
C：burst into
D：burst o
答案(点此获取答案解析）
A
A：burst out
B：burst i
C：burst into
D：burst o
的展开式中第m项的系数为
，若
，则
="( " )
