问题补充：
Can you think of some cases drivers obviously knew the traffic rules but he didn’t obey them.
A. why
B. where
C. as
D. while
答案：
A. why
(答案→)B. where
C. as
D. while
解析：
试题分析:考查定语从句。从结构判断cases后是定语从句，从句是主谓宾结构所以从句用关系副词引导，case是抽象名词，应该用where引导定语从句。而A选项why引导定语从句时需放在先行词reason后；C选项as引导定语从句时先行词前需有the same，such，so等修饰；while不引导定语从句，所以正确选项为B。句意：你能想出这样一些情况吗，司机显然懂得交通规则，但是根本不遵守这些交通规则。
