| 1. | Oh, it must have been that other chap . 啊,很可能是另外一个小伙子。 |
| 2. | It must have been a valuable experience . 那准是有价值的所见所闻了。 |
| 3. | I must have been a trial to them too . 我那时也一定是他们的一块病。 |
| 4. | The theft must have been an inside job . 这一窃案一定是内部人干的。 |
| 5. | She must have been at work from her cradle . 她一定是很小就做工。 |
| 6. | Some of these droughts must have been severe . 有一些旱灾想必是严重的。 |
| 7. | Then there must have been some meaning in it . 那么这里头一定有缘故了。 |
| 8. | She must have been having lessons on the sky . 她准是暗地里一直在上课。 |
| 9. | They must have been rarely gifted by nature . 他们极少接受大自然的馈赠。 |
| 10. | The city at one time must have been prosperous . 这座古城肯定一度很繁荣。 |