问题
选择题
It’s said that Armstrong sent a message to Mission Control _____ said that two huge, strange objects landed near them and were watching them.
A．who
B．which
C．whom
D．whose
答案
答案：B
题目分析：本句中先行词a message为下文定语从句的逻辑主语，指物，故引导词用which，选B。
点评：定语从句引导词的用法比较复杂,其关键就是根据先行词的不同选择不同的引导词.并注意作介词宾语的引导词只能使用宾格形式.that不能用于非限制性定语从句中.