【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;step forward站出來;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。句意:警察已讓事件的目擊者站出來提供幫助。

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