________, in large hotels, there are also apartments, which include two or more rooms connected together, perhaps a bedroom and a living-room．

1. A.
   Therefore
2. B.
   As a result
3. C.
   Ever since
4. D.
   In addition

________ , in large hotels, there are also apartments, which include two or more rooms connected together, perhaps a bedroom and a living-room.

A. Therefore　 B. As a result　　 C. Ever since　　　 D. In addition