问题补充:
The engineer my father works is about 50 years old.
A. to whom
B. on whom
C. with which
D. with whom
答案:
A. to whom
B. on whom
C. with which
(答案→)D. with whom
解析:with whom引导定语从句.with whom放在从句中即为:my father works with the engineer.
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