问题补充:
The scientist, my father works, is about 50.
A. on whom
B. to which
C. with which
D. with whom
答案:
A. on whom
B. to which
C. with which
D. with whom
解析: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:myfather works withtheengineer.所以选D。