All of them are astonished, because such a thing has never (hear) ______of befor

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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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