单选题 It was not until then that I came to know that knowledge comes from practice.
【正确答案】 D
【答案解析】[解析] “not until...that”是固定用法,意思是“直到…才”“come to know”的意思是“开始懂得,开始知道”;“practice”在句中的意思是“实践”而不是“练习”。