问题
选择题
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
答案
答案：B
题目分析：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。