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职称英语
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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2023-09-19
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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。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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