– 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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