Dr. Black comes from either Oxford or Cambridge. I can’t remembe

Dr. Black comes from either Oxford or Cambridge. I can’t remember ______.
A、where
B、there
C、which
D、what
【正确答案】：C
【题目解析】：布莱克博士要么来自牛津，要么来自剑桥，我记不清楚是哪个了。