if you can not read this word,please in the dictionary

题目

if you can not read this word,please in the dictionary
if you can not read this word,please ( ) in the dictionary
1.look at it 2.look for it 3.look it up 4 look up it
选哪个啊帮帮忙,急

答案

look it up 动词+副词的短语动词,如果宾语为名词,其位置可以在短语动词后,也可以夹在中间. eg.Try on the trousers. Try the trousers on. 若宾语是代词,只能夹在动词和副词间. 所以不选look up it