从句问题that's what it takes ...

问题描述:

从句问题that's what it takes ...
Perseverance is a kind of quality-and that's_____ it takes to do anything well.(which,that,what,why)这句话后半句怎么解释?

不屈不挠是一种品质,就是所谓的所从事的任何事情都要做得好.what