题目内容
【题目】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 has begun
【答案】A
【解析】句意:直到他离开家,他才开始意识到家庭对他来说多么重要。Not until为否定的短语,放在句首时主句用部分倒装。
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