问题
Do you remember ________ we got to know each other—It was in 2000 ________ we both studied in Nanjing University.
A:when it was that when
B:when was it that when
C:when it was that that
D:when was it that that
B:when was it that when
C:when it was that that
D:when was it that that
正确答案是：
