Kitty is Class8 and her classroom is the ground floor.A. at; inB. on; onC. in; atD. in; o

问题补充：

Kitty is Class8 and her classroom is the ground floor.

A. at; in

B. on; on

C. in; at

D. in; on

答案：

A. at; in

B. on; on

C. in; at

(答案→)D. in; on

解析：在几班，用介词in，而在地板上，用介词on，故选答案为D