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    ______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.

    A．AsB．ItC．WhatD．Which

    C

    解析试题分析：考查主语从句：句意：我们都知道的是香烟含有尼古丁和其他有害的物质，所以你应该戒烟。第二个is是谓语，前面的是主语从句，主语从句缺少主语，用what连接主语从句，选C。
    考点：考查主语从句

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