These are placid bears that only eat smaller things like rodents and lizards and

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问题 These are placid bears that only eat smaller things like rodents and lizards and none been known to attack humans.

选项 A、none have been
B、none has
C、no other had been
D、no others been

答案 A

解析所填部分应为被动语态，B选项none has和D选项no others been均错误；C选项no other had been与and前的句子时态不符；只有A选项none have been的结构正确。所以选项A为答案。

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