Not until he left his home ______ to know how important the family was for him.

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问题 Not until he left his home ______ to know how important the family was for him.

选项 A、did he begin
B、had he begun
C、he began
D、he had begun

答案A

解析句意：直到离开家他才开始了解家对他来说多么重要。not until置于句首，主句要部分倒装，排除C、D两项；又根据句意得知begin需用过去式，但发生在leave之后，故排除B项。

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中学英语

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