单项选择题

It was not until then that I came to know that knowledge comes from practice.

A) 并不是到那时候我才开始知道知识来自于实践。
B) 自从那时起我才开始知道知识来自于实践的。
C) 直到那时我才知道知识来源于练习。
D) 直到那时我才开始懂得知识来自于实践。
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