问题描述：
4. When Mary finally got there, Tom had left an hour _____.
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考点提示：副词,副词的比较级,疑问副词,连接副词
最佳答案： | B |
| 略 |
4. When Mary finally got there, Tom had left an hour _____.A．beforeB．agoC．laterD．After
4. When Mary finally got there, Tom had left an hour _____.A．beforeB．agoC．laterD．After
最佳答案： 