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

    分析 当他听到这个好消息的时候脸上有一种兴奋的表情．

    解答 答案选B   
    on在…（的表面）上．of…的，at在…地方，over在…上方，这里是"在他的脸上"，用on his face．故选B．

    点评 本题考查的是介词的用法．做此类题时，要注意介词本身的意义．

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