改错:By who was the new educational CD-ROM designed?

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/04/16 19:00:50

who----->whom 此处直接置于介词后,须用宾格.
若借此置于designed后,即不是直接放于who前,那么用who/whom都可以.
再问：为什么不能用who？
再答：介词后面须用宾格形式。所谓的介宾介宾。。who的宾格形式为whom.特别是直接考虑who的某种形式直接置于借此后时，必须用whom. 下面补充回答的“不过，在以下几种情况值得注意”下面第一条。下附who和whom的区别：关系代词who与whom 的用法区别：两者均只用于人，从理论上说，who 为主格，whom为宾格。但实际上，除非在正式文体中，宾格关系代词 whom 往往省略不用，或用who或that代之。如：The man (that, who, whom) you met just now is called Jim. 你刚遇见的那个人叫吉姆。不过，在以下几种情况值得注意。如：(1) 直接跟在介词后面作宾语时，只能用 whom，而且不能省略。如：She brought with her three friends, none of whom I had ever met before. 她带了brought with her three friends, none of whom I had ever met before. 3个朋友来，我以前都没见过。(2) 引导非限制性定语从句且作宾语时，who 和 whom均可用，但以用 whom 为佳，此时也不能省略。如：This is Jack, who [whom] you haven’t met before. 这是杰克，你以前没见过。

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