问题补充:
I can 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: 前半句 “我不会读这些新单词” 所以我要查字典。前半句是“words”是复数排除AB, 又因为代词应放在look 与up中间 所以选C