【題目】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“跨過(guò)”；step forward“站出來(lái)”；step up"增加，(使)加快速度"；step down“讓位，辭職”。由句意可知應(yīng)選B項(xiàng)。句意：警察已讓事件的目擊者站出來(lái)提供幫助。

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