_ data were obtained would be

问题描述:

_ data were obtained would be
processed by a computer.
为什么不能用Which

你题目没写清楚,不过我猜 用which的话引导定语从句,必需是which were processed by a computer
不加which是非谓语动词中的 过去分词做定语,done结构,本身就表示被动意思.
不懂追问,如能帮你,请及时采纳,