Not until he left his home ______ to kno...

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

A．had he begun

B．did he begin

C．he began

D．he had begun

B 【解析】考察倒装句。Not until放在句首的时候，后面的句子使有部分倒装的形式，故排除CD。再看时态，本句不需要使用过去完成时。句意：直到他离开家，他才知道家对他来说是多么重要。

考点分析：

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