There was an excited expression his face when he heard the good newsA. ofB. onC. atD. ov

问题补充：

There was an excited expression his face when he heard the good news．

A. of

B. on

C. at

D. over

答案：

A. of

(答案→)B. on

C. at

D. over

解析：句意：当他听到这个好消息的时候脸上有兴奋的表情。这里用on his face在他的脸上。Of…的，at在…地方，over在…上方，所以选B。