The speed of light is the fastest possible speed is generally accepted. 为什么在句子前面加that

问题描述:

The speed of light is the fastest possible speed is generally accepted. 为什么在句子前面加that

这个句子如果开头没有that,就是一个错误的句子,会造成这个句子中有两个谓语is.加了That后,That the speed of light is the fastest possible speed 就变成了一个由that引导的主语从句,这个从句做 is generally accepted的主语,表示“光速是最快的速度(这个论断)被普遍接受”.