If you meet some new words you can in a dictionary.A. look it up B. look up it C. look t

问题补充：

If you meet some new words, you can in a dictionary.

A. look it up

B. look up it

C. look them up

D. look up them

答案：

A. look it up

B. look up it

(答案→)C. look them up

D. look up them

解析：考查短语词组的使用。代替words用宾格them， 固定词组look up 后接宾格时只能放在中间。