题目内容：
The Great Wall is __________ tourist attraction that millions of people pour in every year．
A．so a well - known B．a so well - known
C．such well -known a
D．such a well- known
参考答案：
答案解析：
单选题：The Great Wall is __________ tourist attraction that million
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- 题目类型：单选题
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B．a so well - known
C．such well -known a
D．such a well- known