问题补充:
The engineer my father works is about 60 years old.
A. to whom
B. on whom
C. with whom
D. with which
答案:
A. to whom
B. on whom
(答案→)C. with whom
D. with which
解析:句意:这个我父亲与之一起工作的工程师大约60岁了。这个句子中含有一个定语从句,work with sb.是固定用法,意思是与某人一起工作,且关系词指人,故用with whom,选C。