问题
选择题
In the past few years, he has collected a lot of ancient coins, _______ date back to the Ming and Qing Dynasties.
A．most of them
B．most of that
C．most of which
D．most of those
答案
答案：C
考查非限定性定语从句关系代词.that只能用于限定性定语从句中,them和those不能用作定语从句引导词,当指物的引导词前有介词时,引导词只能用which,故选C.