问题补充：
He has a friend father is a doctor.
A. who
B. whom
C. whose
D. which
答案：
A. who
B. whom
(答案→)C. whose
D. which
解析：此题考查定语从句，先行词a friend和从句主语father是所有关系，引导词在从句中作定语，故用whose。选C。
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