Not until he left home ____ to know ...

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

A．did he begin; what	B．had he begin; how
C．did he begin; how	D．had he begin; what

C 【解析】本题考查倒装和从句。句意：直到离开家，他才开始意识到这个家对他来说是何等的重要。：not until引导的从句置于句首时，主句需用部分倒装。主从句的动作基本同时发生，故用一般过去时。第二个空所选之词修饰important，故用how。

考点分析：

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Yours truly,

Li Ming

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Not until he left home ______ to know __...