Scientists think that there has been _____(life) on the earth for hundreds of millions of years.为什么课本用单数?

问题描述:

Scientists think that there has been _____(life) on the earth for hundreds of millions of years.
为什么课本用单数?

这里确实是应该用单数的.
对于这个句子来说,there has been……是there be 结构,这里用的是has,所以后面跟的一定是单数,所以用的是life的原型.
希望我的回答能够对你有所帮助
有问题可以继续问我