单选from time to time we must look up words___

问题描述:

单选from time to time we must look up words___
A.the meaning of which we do not know
B.whose meaning we are not familiar
C.we do not know their meanings
D.whose meanings we do not know

答案应该是个定语从句,这个定语从句修饰words.第一,定语从句的结构是先行词+句子.先行词在从句中替代该定语从句要修饰的名词.第二,先行词是代词,某些代词比如whose\where可以等同介词+代词的结构,但不可能是the mean...