the policeman is investigating the ____about the traffic accident
A passer—by B passers-by C passer-bys D passers-bys
he said he wanted to know _____opinion
A somebodty else B somebody else`s C somebody`s else D somebody`s else`s
第二题的标准答案是passers-by用的是哪个知识点啊?还有第三题为啥不在somebody后面加`S啊