Question

请问第七题为什么选B不选A？

Answer 1

Is this factory ____you visited last term?句子还原成正常顺序就明白了：
This factory is ( the one) you visited last term.
完整的句子：
This factory is ( the one that/which) you visited last term.
the one相当于the factory,在从句中当visit 的宾语，是先行词。
如果填A，没有先行词。因为this factory是一起的，this修饰factory.不能说：
This factory is that you visited last term.