2. 外语
  3. All of them are astonished, because such a thing has never______ (hear) of before.

All of them are astonished, because such a thing has never______ (hear) of before.

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问题 All of them are astonished, because such a thing has never______ (hear) of before.
选项
答案been heard
解析 此处空格为谓语的一部分，与其主语such a thing为被动关系，所以应该用其被动语态。
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