_______ is known to us all is that the theme of Shanghai World Expo is “Better C
题型：不详难度：来源：
| _______ is known to us all is that the theme of Shanghai World Expo is “Better City, Better Life”. |
答案
| D |
解析
试题分析：考查主语从句。观察句子结构，不难发现第二个is前面是一个主语从句，从句中缺主语，故使用连接代词what。句意：众所周知，上海世博会的主题是“城市让生活更美好”。 |
举一反三
Jim told us all that _______ he said so at the meeting was right.| A．all | B．what | C．all that | D．that |
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| ______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking. |
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Well, it’s up to you, Aunt Ellen, _____ you stay or go.| A．whether | B．what | C．that | D．if |
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| Before a problem can be solved, it must be obvious ______the problem itself is. |
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