it es to traffic rules, I often e across such cases the local drivers obviously know them but won’t follow them.
A. If; why
B. As; which
C. Once; as
D. When; where
网友回答
A. If; why
B. As; which
C. Once; as
(答案→)D. When; where
解析：考查连词及定语从句。When it es to sth.当提及到……时候；第二空考查定语从句，先行词为cases，在定语从句中作地点状语，选D。