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Carelessness always contributes _______ car accidents. Therefore, drivers are advised to concentrate their attention _______ driving.

A.for; to B.to; on C.with; on D.in; to

B

解析试题分析:考查介词。第一个空是考查“contribute to”指“导致,有助于”;第二个空考查“concentrate one’s attention on”指“集中注意力于”。所以答案选B。
考点:考查介词

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