问题
选择题
I became a student ten years . I have been a student 1996.
I have studied here about 10 years.
A. ago, since, for B. ago ,for ,since C. ago, before, for D ago, in, after
答案
答案：A
题目分析：句意：十年前我成了一名学生，自从1996年我就是一个学生了，我已经在这儿学习大约10年了。ago用于过去时，since+时间点，for+时间段，用于现在完成时，故选A。