There is a new problem involved in the popularity of private cars ______ road conditions need ________.
| A．that; to be improved | B．which; to be improved |
| C．where; improved | D．when; improving |
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There is a new problem involved in the popularity of private cars ______ road conditions need ________.
| A．that; to be improved | B．which; to be improved |
| C．where; improved | D．when; improving |
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