He came here a year _______,and I have been here _______ two years.A before,in B ago,for C before,forC是错的

问题描述:

He came here a year _______,and I have been here _______ two years.
A before,in
B ago,for
C before,for
C是错的

He came here a year __B____,and I have been here _______ two years.
A before,in
B ago,for
C before,for