I at school just now[be动词填空】急

I at school just now[be动词填空】急
I at school just now[be动词填空】
急

I at school just now[be动词填空】急
was

was

was

just now属于明确过去时间，相当于a few minutes ago,跟现在已经没有关联。时态用过去一般。所以i was at school just now.
注意just单独使用是刚刚的意思，是与现在有关联的过去。时态常用现在完成。
i have just arrived here.