题目内容：

in our factory there are 2000 workers,two third of ( )are women
A them
B which
C whom
D who
选哪个,为什么,其他为什么是错的．．?

优质解答

C.通过逗号判断后面是个从句,所以them不能选,若选them,得另起一句话,前面改成句号.
逗号之后叫做非限制性定语从句,这类定语从句中,先行词是物用which,此处是人workers,用who/whom,此处位于介词of之后只能用whom,who不可放于介词之后.