“Which ones do you like best?”中的“ones”是什么意思?为什么用“ones”?

Which 为什么是ones? 为什么Which books do you like better?The_on the desk.里面填ones? some difficult ones like中的ones which geese do they like?They like those ones. ones是什么意思 I can t pick out the ones I like best.为什么是"ONES" which eggs do you like the chocolate ——（egg,ones , Which books do you like?---The thick(one ones one's) try ones best to do中的不定式是什么成分 which ones?these ones?可以说成which ones?these? 翻译 do you have those ones exactly like that Do you like small schoolbags or big ones的意思