My uncle is not rich but he has many books in room. A. he B. his C. him

问题补充：

My uncle is not rich, but he has many books in room.

A. he B. his C. him

答案：

解析：B 考查人称代词。A是主格,作主语；B是形容词性物主代词，作定语修饰名词；C是宾格，作宾语。此处需要用形容词性物主代词，“他的房间”，故选B。