题目内容
【题目】______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.
A. As B. It C. What D. Which
【答案】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。
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