问题描述：
| A new ___ bus service to Tianjin Airport started to operate two months ago. |
| [ ] |
| A. normal B. usual C. regular D. common |
考点提示：形容词
最佳答案： | C |
A new ___ bus service to Tianjin Airport started to operate two months ago. [ ]A. normal B. usual C.
A new ___ bus service to Tianjin Airport started to operate two months ago. [ ]A. normal B. usual C.
最佳答案： 