问题补充：
(·江西)Not until he left his home to know how important the family was for him.
A. did he begin
B. had he begun
C. he began
D. he had begun
答案：
(答案→)A. did he begin
B. had he begun
C. he began
D. he had begun
解析：考查倒装句。句意：直到离开家，他才开始意识到这个家对他来说是何等的重要。not until引导的从句置于句首时，主句需用部分倒装，同时not要置于until之前。由于主句和从句的动作几乎同时发生，故用一般过去时。题干还原为：He didn begin to know how important the family was for him until he left his home.
