―I wonder they are waiting.―At the bus stop.A. who　　B. whom　C. where　D. why

问题补充：

―I wonder they are waiting.

―At the bus stop.

A. who

B. whom

C. where

D. why

答案：

A. who

B. whom

(答案→)C. where

D. why

解析：考查情景交际。根据答语可知，问的是地点，故用where，故选C。