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 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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