Question

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

       A.did he begia                     B.ead he beans              C.he began            D.he has began

Answer 1

A

解析:

考查特殊句式和时态。not until引导的时间状语从句位于句首，主句用部分倒装句；由not until时间状语从句可知所填词时态用一般过去时，故选A项。其余选项形式或时态错误。