This is the fourth time you (be) late for class. 动词填空

This is the fourth time you ( have been) late for class.

填have been
第一点是短语be late for
第二点事This /It is the first/second time ……后面一定要用完成时的某种时态~~

This is the fourth time you be late for class
因为be late for class是固定搭配,意思是上课迟到，等于arrive late for class