A dog ran in front of my mother’s car and she stop very quickly.A. ought toB. had betterC

问题补充：

A dog ran in front of my mother’s car and she stop very quickly.

A. ought to

B. had better

C. used to

D. had to

答案：

A. ought to

B. had better

C. used to

(答案→)D. had to

解析：短语辨析。 A.应该 B. 最好 C. 惯于；过去常常 D. 不得不。句意：一条狗在我母亲的车前跑，他不得不快速停下来。故选D。