选a
因为b选项是表示你的说话对象现在不在你面前.
而用been则表示他又回来了
而
C D两个时态不对
c选项是一般现在时,不合题意
d是一般过去时,不能表达these years这个时间段
所以只能选a现在完成时加been 可以表示一个时间段对现在产生的影响：即他走了一段又回来了
---I am so glad to see you here .I miss you very much .
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