Question

（2006北京崇文模擬）A dog ran in front of my mother's car and she ________ stop very quickly.

1. A.
   ought to
2. B.
   had better
3. C.
   used to
4. D.
   had to

Answer 1

D
句意：一只狗突然竄到媽媽的車前，她不得不迅速停車。have to (used to show that you must do sth.)強調客觀需要，意為“必須，不得不”。