Great changes have taken place in that factory ,It is no longer____it was ten years ago,____it was so poorly equipped1.what when2.that which3.what which 4.which that

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Great changes have taken place in that factory ,It is no longer____it was ten years ago,____it was so poorly equipped1.what when2.that which3.what which 4.which that
Great changes have taken place in that factory ,It is no longer____it was ten years ago,
____it was so poorly equipped
1.what when
2.that which
3.what which
4.which that

Great changes have taken place in that factory ,It is no longer____it was ten years ago,____it was so poorly equipped1.what when2.that which3.what which 4.which that
选1

选2。
that就是the factory。而which it was ten years ago是定语从句,which代替先行词that,在从句中作was的表语。