The Great Wall is tourists attraction that millions of people pour in every year.
A. so a well known
B. such a well known
C. a so well known
D. such well known a
网友回答
A. so a well known
(答案→)B. such a well known
C. a so well known
D. such well known a
解析：考查固定句型。such+a/an+形容词+名词；so+形容词+a/an+名词；排除A、C、D。句意“长城是一个众所周知的旅游景点，以至于每年有几百万人涌入长城。”故选B。