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    【题目】The police have asked for witnesses of the accident to _____ to offer some help.

    A. step across B. step forward

    C. step up D. step down

    【答案】B

    【解析】step across“跨过”；step forward“站出来”；step up"增加，(使)加快速度"；step down“让位，辞职”。由句意可知应选B项。句意：警察已让事件的目击者站出来提供帮助。

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