问题
选择题
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
答案：B
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。