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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