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