问题
选择题
The scientist, __________ my father works, is about 50.
A．on whom
B．to which
C．with which
D．with whom
答案
D
题目分析：句意：和我爸爸一起工作的科学家大约50岁。with whom 引导定语从句，with whom 放在定语从句中即为:my father works with the engineer. 所以选D。