问题：
【题文】There are floors in the building and Mr. Wang lives on the floor.
A．twelve; twelve
B．twelfth; twelfth
C．twelfth; twelve
D．twelve; twelfth
【题文】There are floors in the building and Mr. Wang lives on the floor.
| A．twelve; twelve | B．twelfth; twelfth |
| C．twelfth; twelve | D．twelve; twelfth |
参考答案：