问题
选择题
The engineer ________ my father works is about 50 years old.
A．to whom
B．on whom
C．with which
D．with whom
答案
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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The engineer ________ my father works is about 50 years old.
A．to whom
B．on whom
C．with which
D．with whom
with whom引导定语从句，with whom放在从句中即为：my father works with the engineer。