【题目】There are many people in the office, some ______ are English teachers.
A. of them B. from which
C. of who D. of whom
在线课程【答案】D
【解析】
考查介词+关系代词。句意：办公室里有许多人，其中有些是英语老师。由逗号可以判断出本句为非限制性定语从句，所以A选项被排除。本句中先行词为many people,作of的宾语，所以关系代词为whom，所以C选项被排除，而B选项介词不正确。故D选项正确。