问题补充:
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
答案:
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。