---Why do you look so upset?
---There are so many troublesome problems ____.
| A．remaining to be settled | B．remained settled |
| C．remaining to settle | D．remained to be settled |
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---Why do you look so upset?
---There are so many troublesome problems ____.
| A．remaining to be settled | B．remained settled |
| C．remaining to settle | D．remained to be settled |
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