I must be off now. It’s time I _______ to school.

I must be off now. It’s time I _______ to school.
A、go
B、went
C、will go
D、am going
【正确答案】：B
【题目解析】：it's time+that从句时，that可省略，从句中的谓语动词有两种形式，用动词的过去式或用should+动词原形（should不能省略）。