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

问题补充：

The doctor she sent her friend is very famous.

A. to whom

B. to whose

C. whom

D. at whom

答案：

(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。