Who were you picked up by?
这个句型有点懵懵的, 不明所以, 麻烦告知, 谢谢!
【答】这里的 picked up 是“动词+副词小品词”型动词短语,相当于及物动词,意思是“(用车)接”。如:
Please pick me up at two at my place. 请于2点钟来我家接我。(摘自《英汉多功能词典》新编升级版p.1265)
picked up 的被动语态形式是 be picked up by...,所以:
Who were you picked up by? 的意思是:(是)谁用车接你的?
在这个句子中, Who 是介词 by 的宾语,were picked up 是谓语动词,you 是主语。