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
网友回答
A. for; to
(答案→)B. to; on
C. with; on
D. in; to
解析：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。