3．There was an excited expression ______ his face when he heard the good news．（　　）
A．ofB．onC．atD．over

分析 當(dāng)他聽到這個好消息的時候臉上有一種興奮的表情．

解答 答案選B   
on在…（的表面）上．of…的，at在…地方，over在…上方，這里是"在他的臉上"，用on his face．故選B．

點評 本題考查的是介詞的用法．做此類題時，要注意介詞本身的意義．

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