Reading is one kind of( ).But practing is also ( )and more important than ( )

问题描述:

Reading is one kind of( ).But practing is also ( )and more important than ( )
A.to learn:learning:reading
B.learning:to learn:to read
C.learning:learning:reading
D.to learn:to learn:to read
要写明语法原因

C.learning,learning ,reading为什么了one kind of...of 是介词,后面要接动名词;......is also..is 是系动词,后面要接动名词作表语;
than,是介词,后面也要接动名词。所以要填:learning, learning ,reading