题文
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 |
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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 |
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