问题描述：
| Air service now is back to_____ after two days of heavy fog. |
| [ ] |
| A. usual B. normal C. ordinary D. common |
考点提示：形容词
最佳答案：
| B |
最佳答案：
题目：Air service now is back to_____ after two days of heavy fog. [ ]A. usual B. normalC. ordinary D. com
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