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

試題分析：考查介詞。第一個(gè)空是考查“contribute to”指“導(dǎo)致，有助于”；第二個(gè)空考查“concentrate one’s attention on”指“集中注意力于”。所以答案選B。
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