Not until he left home ______ to know __
问题:
Not until he left home ______ to know _______ important the family was for him.
A.did he begin; what
B.had he begin; how
C.did he begin; how
D.had he begin; what
Not until he left home ______ to know _______ important the family was for him.
A.did he begin; what
B.had he begin; how
C.did he begin; how
D.had he begin; what