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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