With the development of science and technology,the modern aeroplane is not the machine ___it was .

问题描述:

With the development of science and technology,the modern aeroplane is not the machine ___it was .
which 还是that?THX!

应该用that
With the development of science and technology,the modern aeroplane is not the machine (that) it was.
这里的that也可以省略不用的