Question

I enjoy the party very much, but I_______ go home. It's too dark.

1. A.
   leave to
2. B.
   may
3. C.
   mustn't
4. D.
   can't

Answer 1

A
點撥：本題考查情態(tài)動詞must及have to的用法辨析，通讀全句可知“必須”回家的原因是“It's too dark”，是客觀因素，而不是發(fā)自內(nèi)心的，即“have to”。