A、  B、  C、  A听音时，抓住关键词“take…off”，“son”，“hospital”，可知题干与请假有关，同时题干已经说明请假的原因，(A)“好的”是正确的回答。

Do you know why he was fired?
(A) There was a cigarette butt on the grass.
(B) Yes, I understand.
(C) He didn’t achieve the sales target.

Mr. Alfred, by the way, could I take this afternoon off to look after my son in hospital?
(A) All right.
(B) That’s great!
(C) What for?