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

解析空格所填词为从句谓语的一部分，such a thing与从句的谓语动词存在被动关系，且从句为现在完成时，所以空格处应该填been heard。

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[originaltext]W:Paul,youaremovingtoNewYork?M:Yeah.W:Why?M:Because