下面句子中的on the subject怎么解释?“得到的描述到底充不充足?”

题目

下面句子中的on the subject怎么解释?“得到的描述到底充不充足?”
Not all that Mrs.Bennet,howere,with the assistant of her five daughters,could ask on the subject was sufficient to draw from her hasband any satisfactory description of Mr.Bingley.
on the subject 后面的was sufficient 与句子是什么关系，是修饰什么的？

答案

先分析一下句子：主干：Not all that Mrs.Bennet could ask (前面是主语) was sufficient （系表结构） to draw any satisfactory description.（不定式作表语的补语）直译：不是Bennet太太所能问的全部问题都足以得...