问题补充：
is well known to us all is Kobe has become one of the most popular NBA players.
A. It; that
B. As; that
C. What; what
D. What; that
答案：
A. It; that
B. As; that
C. What; what
(答案→)D. What; that
解析：考查固定句型。It is known to us all that…/What is known to us all is that…/As is known to us all, … 这三个句型可相互转换，所以本题应选D.
