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Our university has several labs,the largest one_______was bu

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Our university has several labs,the largest one_______was built 10 years ago.
A./ B.which C.on which D.in which
Our university has several labs,the largest one_______was bu
of which
再问: 我选项打错了,再问一下为什么不用that
再答: of which 表范围, 意思等于 of all the labs "在所有的这些实验室中", 介词of 前置,此时不能用that, 只能是which