—We have done a lot to make our city cleaner，but it’s still not enough．
—So we should do________to improve it．
| A．less |
| B．higher |
| C．later |
| D．more |
—We have done a lot to make our city cleaner，but it’s still not enough．
—So we should do________to improve it．
| A．less |
| B．higher |
| C．later |
| D．more |
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