题目

________ is well known to us all is ________ Yao Ming has become one of the most popular NBA players. A．It; that  B．As; that C．What; what  D．What; that   答案： D 第一空what引导主语从句，第二空that引导表语从句。若选A则可以去掉第二个is，成为It is...that... 结构；若选B项则可以去掉第二个is和选项中的that，后再加一逗号，此时as引导非限制性定语从句。  

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