______ is known to us is that tobacco contains nicotine and other harmful produc
题型：不详难度：来源：
| ______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking. |
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。 |
举一反三
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| Before a problem can be solved, it must be obvious ______the problem itself is. |
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________ Barbara Jones offers to her fans is honesty and happiness.| A．Which | B．What | C．That | D．Whom |
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