问题
选择题
Not until he left his home _____ to know how important the family was for him.
A．did he begin
B．had he begun
C．that he began
D．he had begun
答案
答案：A
题目分析:考查倒装句。Not until +从句位于句首时从句需用部分倒装语序，即一般疑问句语序。所以排除C、D选项，而根据时间状语从句until he left his home 可以判断主句应该用一般过去时，故A选项正确。
句意：直到离开家他才开始知道家庭对他来说是多么的重要。