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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