问题补充:
If you don’t know the word, you can in the dictionary.
A. look it after
B. look it up
C. look for it
D. look at it
答案:
A. look it after
(答案→)B. look it up
C. look for it
D. look at it
解析:B 考查短语。以动词和副词构成的短语,宾语是代词it/ them大牛股时,必须放在而这中间。“查找,查寻”是look up,故选B。