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--- The number of red-crowned cranes is becoming smaller and smaller.
--- Yes. People working in the reserves are doing everything they can ______ these birds.（　　）

A．protect

B．protecting

C．to protect

D．protected

【考點】動詞不定式．

【答案】C

【解答】

【點評】

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發布：2024/4/20 14:35:0組卷：3難度：0.6

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--- The number of red-crowned cranes is becoming smaller and smaller.--- Yes. People working in the reserves are doing everything they can ______ these birds.（ ）