第一句正确, would like to do sth. 想做某事,所以用动词不定式How many cartons of milk would you like to buy every day. 正确。祝你学习进步,更上一层楼,快乐每一天!(*^__^*)
要用有to 的句型 would like to do sth 想要做某事 因为buy 是动词 所以要有to 如果后面是名词 would like 后就直接加名词 不用to