属于确定指称的是（）
A.Tom and Bill passed the port in the evening.（port=harbour）
B.Tom walked into a music room. The piano was in the 19th century.（There was a piano in the room Tom walked into.）
C.Tom works too hard（for his boss）.
D.Tom has a（scientific）brain.
正确答案：Tom walked into a music room. The piano was in the 19th century.（There was a piano in the room Tom walked into.）