If you dont know the word you can in the dictionary. A. look it afterB. look at it C. l

问题补充：

If you don know the word, you can in the dictionary.

A. look it after

B. look at it

C. look for it

D. look it up

答案：

A. look it after

B. look at it

C. look for it

(答案→)D. look it up

解析：look after照看，照顾；look at看；look for寻找；look up向上看，查阅。句意：如果你不认识这个单词，你可以在词典里面查一查。人称代词做由动词+副词构成的动词短语的宾语时，一般要放在动词后面，副词前面，故选D。