题文
It is difficult for us to learn a lesson in life______we’ve actually had that lesson.
| A．until |
| B．after |
| C．since |
| D．when |
推荐试卷
It is difficult for us to learn a lesson in life______we’ve actually had that lesson.
| A．until |
| B．after |
| C．since |
| D．when |
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