I by my teacher’s home when I was back home last night.A. droppedB. dropped onC. drop inD.

问题补充：

I by my teacher’s home when I was back home last night.

A. dropped

B. dropped on

C. drop in

D. dropped into

答案：

(答案→)A. dropped

B. dropped on

C. drop in

D. dropped into

解析：考查固定短语。drop in at sp.“拜访某地”；drop in on sb.“拜访某人”。drop by“顺便拜访”。句意“昨晚当我回家时，我顺便拜访了老师家。”故选A。