The doctor she sent her friend is very famous.A. to whom B. to whose C. whom D. at whom

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(答案→)A. to whom
B. to whose
C. whom
D. at whom
解析：考查定语从句，先行词是the doctor，定语从句中sent her friend 后面是to sb，用to whom引导，句意：她把朋友送去的医生是很有名的。选A。