The policeman caught the drunk driver but he didn’t remember the old lady.A. knock down

问题补充：

The policeman caught the drunk driver, but he didn’t remember the old lady.

A. knock down

B. to knock down

C. knocked down

D. knocking down

答案：

A. knock down

B. to knock down

C. knocked down

(答案→)D. knocking down

解析：

试题分析: 句意：警察抓住了酒驾司机，但是他不记得被撞倒的老太太。knock down撞倒；remember to do记得去做某事，remember doing记得做过某事；根据语境可知是酒驾司机因为喝多了，被警察抓住后不记得他撞倒的老太太，故选D。