— May I come in? I'm sorry I am late.

— Come in, please. But could you please tell me 　　　 ?

A. how do you come to school　　 B. what were you doing then

C. who you talked with　　　　　　 D. why you are late again

—May I come in?

—________

A. Come in, please.　　　　 B. It doesn’t matter.　　　　 C. That’s OK.

—May I come in! I’m sorry I am late.
—Come in, please tell me       .
A、why you are late again
B、what were you doing
C、who did you talk with