Now these magazines__ in the library for a long time.have been kept可是为什么have been keeping不对?

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Now these magazines__ in the library for a long time.
have been kept可是为什么have been keeping不对?

这个首先从动词去分析,杂志是被保管,所以是被动语态 be kept
后面跟了时间状语for a long time
所以用现在完成时表持续发生
请在客户端右上角评价点“满意”即可

have been 加过去时态啊