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 begun C. he began D. he had begun |
答案
答案：A
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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 |
答案：A