43.It’s already 5 o’clock now.Don’t you think it’s about tim

43.It’s already 5 o’clock now.Don’t you think it’s about time ________?
A) we are going home
B) we go home
C) we went home
D) we can go home
为什么不选B呢？正确答案是C 但是我觉得选B，好像没有什么时态问题啊？