There is a clock the wall and windows are the wall.A. on inB. in onC. in in D. on; on

问题补充：

There is a clock the wall and windows are the wall.

A. on, in

B. in, on

C. in, in

D. on; on

答案：

(答案→)A. on, in

B. in, on

C. in, in

D. on; on

解析：on the wall，表示在墙上，而in the wall，表示在墙的内部，故选答案为A