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