题目内容

Not until he left his home ______ to know how important the family was for him.
A.had he begunB.did he beginC.he beganD.he had begun
B
考察倒装句。Not until放在句首的时候,后面的句子使有部分倒装的形式,故排除CD。再看时态,本句不需要使用过去完成时。句意:直到他离开家,他才知道家对他来说是多么重要。
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