Question

（2006北京崇文模拟）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：一只狗突然窜到妈妈的车前，她不得不迅速停车。have to (used to show that you must do sth.)强调客观需要，意为“必须，不得不”。