Question

Not until he left his home________to know how important the family was for him

1. A.
   did he begin
2. B.
   he begins
3. C.
   he began
4. D.
   he has began

Answer 1

A
“直到离开家他才知道家对于他是多么重要。”否定意义的副词放于句首句子用部分倒装，答案A。