11.He spoke with more eagerness ______ is appropriate on suc

11.He spoke with more eagerness ______ is appropriate on such occasions.( ) A.than that B.than
11.He spoke with more eagerness ______ is appropriate on such occasions.( )
A.than that B.than what
C.than D.other than
请问这道题的正确答案为什么是C,而不是B呢?
than有做为直接的代词用法么?还有相关的例句么?