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.）