The Great Wall is ______ tourists attraction that millions of people pour in every year
A.so a well knownB.such a well knownC.a so well knownD.such well known a在线课程B
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。