The engineer ______ my father works is about 50 years old.
A. to whom
B. on whom
C. with which
D. with whom
The engineer ______ my father works is about 50 years old.
A. to whom
B. on whom
C. with which
D. with whom
D
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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