Question

------It was determination and willingness that made him a good actress.
------Yes, that is also______it takes to do anything very well.

A．that

B．how

C．what

D．which

Answer 1

C

 what引导的表语从句, what在从句中作takes的宾语。句意：是的，这也是做好一切事情所需要的东西。若选A、D项，则加上先行词，构成定语从句。