单选题
Not until he left his home ______ to know how important the family was for him.
A、
did he begin
B、
had he begun
C、
he began
D、
he had begun
【正确答案】
B
【答案解析】
not until放在句首要用部分倒装，翻译为直到，所以begin发生在left之后或同时发生。句意为：直到他离开家，他才开始知道家庭对他来说多么重要。
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