There are 500 students in our school,45% (of whom)are boys.为什么要填"_英语解答

There are 500 students in our school,45% (of whom)are boys.
为什么要填"of whom",而不是"of them"

人气：421 ℃　时间：2019-09-22 07:45:32

解答

定语从句
包含介词的定语从句
whom 指代students