问题
选择题
The reason _____ he refused to attend the meeting was that they didn't give him an invitation earlier.
A．how
B．why
C．which
D．that
答案
答案：B
题目分析：句意，他们拒绝参加会议的原因是因为他们没有提前向他发出邀请。根据前置词the reason可知引导词需用why为什么。故选B。
点评：定语从句中引导词有比较固定的用法，我们应熟记这些基本规则。