he said something,but she didn't___catch it

1.答案：3.
2.翻译：他（的确）说了些话,但是她没有完全听明白/清楚.
3.
1）very/rather/quite/so都是程度副词,都可以用以修饰形容词/副词,意思是“十分/很/非常”.
如：The exam is over at last.I'm very/rather/quite/so.
2) 但是只有quite可以修饰动词(短语),意思是“完全/彻底地”.
I am afraid I can not quite agree with you about that.
关于这一点,恐怕我不能完全赞同你.
具体可参阅：http://www.***.com/I%20can't%20quite%20agree%20with%20you./

3

QUITE

quite
表示程度的副词。