题文
--- Red-crowned cranes need more people’s help.
---Yes. People working in the reserves are doing everything they can ____these birds.
| A．save | B．saving |
| C．to save | D．to saving |
--- Red-crowned cranes need more people’s help.
---Yes. People working in the reserves are doing everything they can ____these birds.
| A．save | B．saving |
| C．to save | D．to saving |
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