I order to make it clear ,I must go up to ( )second floor and ask him( )second time

题目

I order to make it clear ,I must go up to ( )second floor and ask him( )second time
A.the ,a B.the ,the C.a,the D.a,a

答案

选A
the second 强调顺序
a second 强调次数
为了弄明白这事,我必须去二楼再问他一次.