We are now faced with a new problem involved in the popularity of private cars __________ road conditions need __________.
| A．which; to be improved | B．that; to be improved |
| C．where; improved | D．when; improved |
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We are now faced with a new problem involved in the popularity of private cars __________ road conditions need __________.
| A．which; to be improved | B．that; to be improved |
| C．where; improved | D．when; improved |
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