Please drop ＿＿＿＿＿＿＿ my home when you are free. A. inB. onC. in onD. in at

问题补充：

Please drop ＿＿＿＿＿＿＿ my home when you are free.

A. in

B. on

C. in on

D. in at

答案：

A. in

B. on

C. in on

(答案→)D. in at

解析：drop in at sp.顺便拜访某地