2. 外语
  3. Polar bears Aappear bow-legged, but the purpose of this strange walk is Benable these massive animals to Cmaintain their balance

Polar bears Aappear bow-legged, but the purpose of this strange walk is Benable these massive animals to Cmaintain their balance

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问题 Polar bears Aappear bow-legged, but the purpose of this strange walk is Benable these massive animals to Cmaintain their balance without Dslipping.
选项 A、 
B、 
C、 
D、 
答案B
解析 Enable is an incorrect form where an infinitive is needed as the subject complement after is. Correction: to enable.
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