题文
This used to be a very pretty valley and attracted many visitors.
| A．at a time |
| B．at no time |
| C．at one time |
| D．from time to time |
推荐试卷
This used to be a very pretty valley and attracted many visitors.
| A．at a time |
| B．at no time |
| C．at one time |
| D．from time to time |
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