题文
__________ our earth, or else it will be no longer fit for us to live on.
| A．Protecting |
| B．To protect |
| C．Protect |
| D．Protected |
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__________ our earth, or else it will be no longer fit for us to live on.
| A．Protecting |
| B．To protect |
| C．Protect |
| D．Protected |
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