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

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

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

选择which把。句子划分一下,应该是从machine处分,这是个定语从句,后面句子修饰the machine,后面句子it是形式主语缺乏真正主语that在句子中作连接词不做成分,假如选that,后面句子是it is句子又不完整。故用which

that

随着科学和技术的发展,现代飞机已不是以前的机器了