问题
选择题
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
答案
答案：A
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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：A