Professor Tang didn’t give us a speech todayIt washe had a traffic accident on the way to

问题补充：

Professor Tang didn’t give us a speech today．It washe had a traffic accident on the way to school．

A. that

B. when

C. why

D. because

答案：

A. that

B. when

C. why

(答案→)D. because

解析：考查连词的用法。句意：唐教授今天没有给我们做演讲，那是因为她在去学校的路上发生了交通事故。所以选D。