Not until he left home ______ to know _______ important the family was for him.
A．did he begin; whatB．had he begin; how
C．did he begin; howD．had he begin; what
C
本題考查倒裝和從句。句意：直到離開家，他才開始意識到這個家對他來說是何等的重要。：not until引導的從句置于句首時，主句需用部分倒裝。主從句的動作基本同時發(fā)生，故用一般過去時。第二個空所選之詞修飾important，故用how。
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