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。