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

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：句意：如果你遇到一些生词，你可以查阅字典。look up查阅，代词放在动词和副词的中间，故选C.