one of the most important things I've learned is how much there is to learn,and how much I don't yet know.
问题描述：
one of the most important things I've learned is how much there is to learn,and how much I don't yet know.
为什么how much之前的是is而不是are呢?不是并列的两个吗?
答
因为主语是 one
我学到的最重要的事情之一是（谓语用第三人称单数）...
即使宾语是并列的两个,但谓语形式要盯住主语.