No one believes his reasons for being late that he was caught in a traffic jam made him

问题补充：

No one believes his reasons for being late that he was caught in a traffic jam, made him embarrassed.

A. it

B. which

C. that

D. why

答案：

A. it

(答案→)B. which

C. that

D. why

解析：考查非限制性定语从句。根据句意：没人相信他迟到的原因就是他遇上了交通拥挤，这使他很尴尬。用which，指前半句话的含义。故选B。