--- Why do you look sad?
---There are so many problems ______.
| A．remaining to settle |
| B．remained settling |
| C．remaining to be settled |
| D．remained to be settled |
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--- Why do you look sad?
---There are so many problems ______.
| A．remaining to settle |
| B．remained settling |
| C．remaining to be settled |
| D．remained to be settled |
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