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
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B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。