I became a student ten years . I have been a student1996. I have studied here about 10 ye

问题补充：

I became a student ten years . I have been a student1996. 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：

解析：句意：十年前我成为了一名学生。自从1966年以来我已经是名学生了。我已经在这学习十年了。since +时间点，具体时间，表示自从……以来；而for + 时间段，故选择A。

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