Not until he left his home ______ to know how important the family was for him.
A．did he beginB．had he began
C．he began D．he had begun
A
考查倒裝句。Not until…位于句首，主謂應(yīng)部分倒裝。又因?yàn)閎egin不是發(fā)生于left之前，故不需用過(guò)去完成時(shí)。
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