When all is said and done,to most of our customers what matters is quilty.为什么不能用what mattered

问题描述:

When all is said and done,to most of our customers what matters is quilty.
为什么不能用what mattered

用what mattered就不能与前面的从句保持时态的一致了.从全句看,用一般现在时正确.