问题
选择题
That passenger was very impolite to the conductor, ______, of course, made things even worse.
A．who
B．which
C．what
D．that
答案
答案：B
题目分析：考查非限制性定语从句，which引导非限制性定语从句，可以修饰前面的句子,句意：这个乘客对乘务员不礼貌，这使得事情更糟。选B。
点评：注意非限制性定语从句不能用that引导。