Can you think of some cases drivers obviously knew the traffic rules but didn’t obey them

问题补充：

Can you think of some cases drivers obviously knew the traffic rules but didn’t obey them?

A. why

B. where

C. as

D. which

答案：

A. why

(答案→)B. where

C. as

D. which

解析：where 引导定语从句修饰先行词cases.