题目内容
I'm sorry I ______ be here so early.
用情态动词(can, may, must, need, have to, be able to)的正确形式填空:
Mr Black said to Jenny White, "If you can't get here on time, I ______write to your father."
His father ______ work for a landlord (地主)in his childhood.
Bikes ______ be put in front of the shop.
The young man over there ______ be at least twenty-five years old.