Not until he left his home ______ to know
题型:单项选择题
问题:
Not until he left his home ______ to know how important the family was for him.
A.did he begin
B.had he begun
C.he began
D.he had begun
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