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Carelessness always contributes _______ car accidents. Therefore, drivers are advised to concentrate their attention _______ driving.
A.for; toB.to; onC.with; onD.in; to
B

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。
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