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

A. who                                  B. there                                C. which                                D. what

Dr. Black is a professor of chemistry. _______, he is a famous writer.

A. In all                           B. In brief                         C. In fact                   D. In addition

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

A. where     B. there     C. which         D. that

Dr. Black comes from either Oxford or Cambridge, I can’t remember where .

Dr.Black comes from either Oxford or Cambridge，I can’t remember_________.?

A.where  B.there  C.which    D.that?