题目内容：

she is a happy girl, she has nothing _____
A to worry B worry about C to worry about D worring

优质解答

nothing to worry about 选择C
nothing 后面接不定式做nothing的定语
类似的用法还有：
something to eat/drink/talk about/...
anything to eat/drink/talk about/...
以此类推~
祝你英语进步!