题目暗含了两种时态：
去年在这里读了一年，现在不在那里读了。表示过去发生的事情对现在造成的影响或结果，用现在完成时：I have studied here for one year./since last year.
去年在这里读了一年，现在还继续在那里读了。表示过去发生的事情对现在造成的影响或结果，而且动作还在持续。用现在完成进行时：I have been studying here for one year.
不明白继续追问，加油！
I had been studied here for a year last year .
i have been studying here from the start of last year to now
I have studied here for a year
i have been studying here for one year.
i have been studing here for one year since last year.
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