----Thank you very much for giving me a hand when I was in trouble.

------Don’t mention it. I only did what anyone else _______ in my place.  

A．must do

B．might do

C．would have done

D．can have done

因技术、工艺或者材料发生变化导致原申报的职业危害因素及其相关内容发生重大变化的，在技术、工艺或者材料变化之日起（）日内进行职业危害申报。

A.15

B.20

C.30