Dr. Black comes from either Oxford or Cambridge, I can't remember ____. [ ]

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Dr. Black comes from either Oxford or Cambridge, I can't remember ____. [ ]
A．where B．there C．which D．that
到底选什么我要理由

选C which
这个which是指代Oxford 或Cambridge，实际上which后面省略以下成份：
...I can't remember which (university Dr. Black comes from)
由于这部分内容跟主句重复，因此将其省略以使句子简洁明了。

D.that