people are trying hard to protect and record what is left.为什么不是what has been left?

问题描述:

people are trying hard to protect and record what is left.为什么不是what has been left?

(违法的). There are now not many barking deer left. So it is important 15 people to protect wild animals. 1. A. work B. study C. live

因为前边的people are trying hard to protect and record,这个表示现在人们还在做这件事,并没有停止,将来也不会停,换句话说,100年后人们还在保护和记录的事物,有可能是今天发生的,或者是明天发生的,所以这个事并不...