【题目】差不多到了两百年之后， Charles Babbage 才把我制成了一台分析机器。
It took about two hundred years as an analytical machine by Charles Babbage.

【答案】efore I was built / before I was made
【解析】句型“it was +时间段+ before …” 表示 “过了（多长时间）才……”。分析语境可知主语“I”是“被制造出来”，所以用被动语态。所以答案是before I was built / before I was made.