Computer is the machine that is used by most people nowadays.这个句子有错误吗?

问题描述:

Computer is the machine that is used by most people nowadays.这个句子有错误吗?

Computer is a machine that is used by most people nowadays.
我觉得这里用a 更好,泛指计算机是一种机器.that 在这引导的是同位语从句吗?that在同位语从句里面不是不可以做主语的吗?是定语从句,that在这个从句中作主语同位语从句的话,引导词是不做成分的,后面是个完整的句子