问题补充：
Zhanglin was lost in computer games during his last year in high school, otherwise he a student at Beijing University.
A. would have been
B. can be
C. has been
D. had been
答案：
(答案→)A. would have been
B. can be
C. has been
D. had been
解析：句意：张林在高中的最后一年沉溺于电脑游戏，否则，他就会是北京大学的学生了。因为前提是张林在高中的最后一年沉溺于电脑游戏，所以他是北京大学的学生是虚拟语气，这里的otherwise相当于一个虚拟条件句：Zhanglin hadn’t been lost in computer games during his last year in high school,由此可以看出是对过去的情况相反的虚拟条件句，主句用would have done，选A。
