________isknowntoall,Maryisanice

发布时间:2020-07-10 04:04:03

________ is known to all, Mary is a nice girl.













A.As












B.It











C.Which











D.That

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A解析思路分析:根据句意和结构,此空应填关系代词as代表主句的整个内容,引导非限制性定语从句,并在从句中作主语.
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