【題目】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：直到他離開家，他才開始意識到家庭對他來說多么重要。Not until為否定的短語，放在句首時主句用部分倒裝。

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