I am sorry, I am so sorry, I am so extremely sorry.
举一反三
- I am sorry( keep )_______ you waiting for so long .
- I am sorry (give) ___________ you so much trouble
- I am sorry that I have kept you (wait) ________ for so long.
- I am so sorry to hear about the accident and I ________ you will get better soon.
- I am so sorry ____ being late. A: about B: in C: for D: of