Question

_____was most important to her,she told me,was her family为什么用what不用it

Answer 1

这是一个主语从句。因为横线上所指的是句子最后的her
family.显然，是一个成分，而what
在此指的便是。然后中间的she
told
me
是一个插入语，可有可无。这样一来，其实句子可以简化为
What
was
important
to
her
was
her
family.
而用it的话只能是It
was
important
to
her
.

Answer 2

因为句子的真正谓语是后面的was。
(_____was
most
important
to
her),<she
told
me,>was
her
family
括号部分是what引导的
主语从句
，意为“她认为对她最重要的”，在句中充当主语，尖括号部分是
插入语
。
句子主干是：（）was
his
family。
希望帮到你！