I by my teacher’s home when I was back home last night.
A. dropped
B. dropped on
C. drop in
D. dropped into
网友回答
(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。