Question

( ) off her parents before, Jane began to be worried at the idea of living on campus in the new

term A not having lived B having not lived C to not live D not to live 求详细解释

Answer 1

A
这是非谓语的否定

由于在此之前他从没有离开过他的父母，见开始担心新学期的住校生活

off her parents before这部分的逻辑主语是jane,jane和live是主动关系，不是目的和将来，排除CD
用having done的分词完成式，表示的是一种主动的，并且是过去完成时的概念，相当于：
because jane hadn't lived off...

又是否定，非谓语的否定是结构的否定，在非谓语之前加not

Answer 2

A. not having lived 这是现在分词的完成否定式作时状, 表示状语的动作发生在谓动的动作之前.
not having done sth, sb did sth. 以前没有做某事....某人就做了某事