分类：教育/科学-外语学习-英语考试
问题：英语Perseveranceisakindofquality.A 
severance is a kind of quality.And that's()it takes to do anything well.A.what B.that C.which D.why
回答：选a 表语从句。
what在名词性从句中不仅起连接作用,而且作句子成分。what it takes to do anything well作句子的表语。
坚持不懈是一种好品质，它也是做好一切事情所需要的。