The doctor ________ is leaving for Africa next month．

A.the nurse is talking to him

B.whom the nurse is talking

C.the nurse is talking to

D.who the nurse is talking

答案及解析： C

解析：

该题doctor后面为定语从句，引导词在从句中作宾语，应用关系代词whom/who/that，或被省略。A项him重复；

B项和D项缺少介词to。