I can’t read these new words so I have to in the dictionary.A. look it upB. look up itC.

问题补充：

I can’t read these new words, so I have to in the 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：C 考查look up的用法。以动词和副词构成的短语，宾语是代词it/ that时，必须放在二者之间，排除B/ D。words是复数，故用them，选C。