28. I'm afraid we'll have to work extra hours for there are still some problems ________.
| A．remaining to settle | B．remaining to be settled |
| C．remained to be settled | D．to remain to settle |
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28. I'm afraid we'll have to work extra hours for there are still some problems ________.
| A．remaining to settle | B．remaining to be settled |
| C．remained to be settled | D．to remain to settle |
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