It was not until then when I cameto know that knowledge comes only from practice. A B C DB

发布时间：2020-08-17 13:32:19

It was not until then when I cameto know that knowledge es only from practice.
A             B        C           DB  when I came ---did I e 

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(答案→)B  when I came ---did I e 
解析：这里要用倒装语序。
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