that和what有什么区别?

Question

( B )27.Ann examined the apples one by one and threw away these ______were spoiled. A who B. that C. what D. where

Answer 1

B
引导名词性从句时，that
只起引导作用，不做从句中的句子成分。
what
在引导名词性从句时，必须同时起到两个作用：引导从句和作从句中的一个句子成分。
引导定语从句时，that
要在从句中作主语或宾语，指人或物都可以；同时指人和物也可以。
They
sre
talking
about
the
things
and
persons
that
they
remembered.
有语法学家说，what
也可以引导定语从句，但此时没有先行词。
（本人认为，此时what引导的是名词性从句）
所以本题中，后半部有两种说法：
...these
that
were
spoiled
or
...what
were
spoiled