Question

语法选择She understood__kind and loving her father was when he was raising his six children alone.

A.how B.what C.so D.such

Answer 1

选B.what。
这是what 引导的宾语从句，做动词understood的宾语、宾语从句是L:
what kind and loving her father was 。

Answer 2

选择A
how引导的感叹句
how+形容词+主语+谓语

Answer 3

选A， how引导的感叹句针对形容词kind and loving感叹
不能是B， 如果是的话，句子要变成What a kind and loving father he was.what在感叹句里只能对名字感叹。