题目内容：

It ___ he is late for class.
It ___ he is late for class.
A.may that
B.might that
C.may be that
D.might be what
请问选什么并说明理由,不要报个答案了事,

优质解答

选C
It 【主语】might be【系动词】 that he is late for class【表语从句】.
A和B,缺少谓语动词,而D中what不能引导表语从句