-----“How long have you stayed in this hotel?”--“Not long just this Monday.”A. onB.

问题补充：

-----“How long have you stayed in this hotel?”

----- “Not long, just this Monday.”

A. on

B. since

C. until

D. after

答案：

A. on

(答案→)B. since

C. until

D. after

解析：此答句为省略句，补充完整为：I’ve stayed in this hotel since this Monday.