we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.
A. Since
B. Although
C. Because
D. Unless
网友回答
A. Since
(答案→)B. Although
C. Because
D. Unless
解析：句意：虽然我们同学三年，但是她没有给我留下深刻的印象，所以我毕业后不记得她了。四个选项的含义分别是：A. Since自从，因为，B. Although虽然，C. Because因为，D. Unless除非，因为我们是同学和我记不得她是转折关系，所以用although。所以选B。