-----is known to all is that the Diaoyu Islands ha

发布时间：2021-02-24 01:34:41

-----is known to all is that the Diaoyu Islands have belonged to China since ancient times.A.As B.It C.What D.That

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C what is known to all是主语从句,整个做主语,横线部分少从句的主语,所以用疑问代词what
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供参考答案1:
B.it指代that后面的句子
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