问题
选择题
Not until he left his home ______ to know how important the family was for him.
A．did he begin
B．had he began
C．he began
D．he had begun
答案
答案：A
考查倒装句。Not until…位于句首，主谓应部分倒装。又因为begin不是发生于left之前，故不需用过去完成时。
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