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 本题考查被动语态。此处空格为谓语的一部分，与such a thing为动宾关系，所以应该用其被动形式。
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