look it up与look them up有什么区别,怎么用

look it up与look them up有什么区别,怎么用 look up it 还是look it up 什么时候是look up them ,什么时候look them up? look it up Look it up!翻译 look them up还是look it upYou'd batter look ( )up in a dictionary when you see word我知道这句话后半句是个病句,但我想知道当look up用作 在字典中查单词时,word应为单数还是复数look与up之间用them还是it If you don't know the words,you can _____in a dictionary.A.look it up B.look up them C.look them up D.look up it选择. It's impolite to__others when you tale with them.A look at B look hard at C look over D look up look at the paper on the floor,please pick it up 还是 pick them up? look up与look at 的区别 look up与look for的区别 look over 与 look up区别是什么? put it down 与put down it 的区别,还有look it up和look up it的区别. look them look them look them 为什么说look it up 却说look for it 为什么说 look it up 而不说look it for