单选from time to time we must look up words___A.the meaning of which we do not knowB.whose meaning we are not familiarC.we do not know their meaningsD.whose meanings we do not know

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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 meaning of which这种名词结构.
第三,先行词后面引导的应当是个语序正常的完整句子.
本题中,这个从句原本应当表达 we do not know the meanings of the words.或者we do not know the words' meanings.主语we 谓语do not know 宾语 the meanings.words在里面是meanings的定语.先行词替代的是words,其它成分应当语序不变,介词虽然不符合习惯,但按照严格语法可以提前.
也就是说,这里可以用whose meanings we do not know,也可以用of which we do not know the meanings.但是不可能把the meanings 提前,打乱句子正常的语法结构.

名词words先行词是复数,后面的定语从句用引导词whose.

这个句子先行词是words,如果选A,先行词就变成了the meaning