问题
选择题
Gun control is a subject ________Americans have argued for a long time.
A．of which
B．about which
C．with which
D．into which
答案
答案：B
题目分析：句意：枪支的控制是美国人争论了好长时间的话题。这里使用了定语从句，先行词是subject，关系代词前用什么介词要取决于本句中的“argue”。argue about sth.选B。