—How long have you been studying in No. 8 Middle School?
—More than two years.
—So it will be less than one year you graduate from it.
A. when
B. before
C. after
D. since
网友回答
A. when
(答案→)B. before
C. after
D. since
解析：连词辨析。When当……时，既然；before在……之前；after在……之后；since自从……以来。句意：你在第八中学学习多久了？——两年多了。——因此到你从这儿毕业还有不到一年的时间了。结合语境可知此处指的是毕业前的这段时间，故选B。