B.D.

例句：

1. 1.The meeting was postponed due to the bad weather.
   由于恶劣的天气，会议被推迟了。
2. 2.The doctor advised him to take a rest after the operation.
   医生建议他在手术后休息一下。
3. 3. The book is about the history of China from ancient times to the present day.
   这本书讲述了从古代到现代的中国历史。