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

什么时候是look up them ,什么时候look them up? look up it 还是look it up look up sth还是look sth up 是look after them,还是look them after? look at the paper on the floor,please pick it up 还是 pick them up? who do i look up I look up on you. look them look them look them LOOK UP AND SMILE 还是 LOOK UP AS SMILE look up和look look up look up look up look up ——Do you think there are too many new words in this unit?——yes,that's right.I'll _____first.——Do you think there are too many new words in this unit?——yes,that's right.I'll _____first.填look them up 还是look up them 答案是look t 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