— Could you tell me yesterday?— Because the traffic was heavy.A. why you came lateB. when

问题补充：

— Could you tell me yesterday?

— Because the traffic was heavy.

A. why you came late

B. when you came here

C. where you came from

D. how you came here

答案：

(答案→)A. why you came late

B. when you came here

C. where you came from

D. how you came here

解析：英语宾语从句中一般为陈述语序。句意：你能告诉我昨天你为什么迟到了吗？——因为交通非常拥挤。结合语境可知选A。