选C.固定搭配.具体的看下面.
1、be full of :
I am full of confidence.这里是动词（be)+full of
2、full of:
I will succeed with full of confidence.这里的
full of 是一个短语,修饰后面的名词,一起做句中状语成分
3、be filled with侧重于动作和装的东西
The basketball is filled with apples by the old man.
4、be full of 侧重于状态
The bottle is full of water.