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 ； improving | 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 ； improving | D．when ； improving |
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