If all of us pull together, there must be something we can do _____.
| A．improve the environment |
| B．to improve the environment |
| C．improving the environment |
| D．improved the environment |
If all of us pull together, there must be something we can do _____.
| A．improve the environment |
| B．to improve the environment |
| C．improving the environment |
| D．improved the environment |
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