属于什么类型的过去完成时?

题目

属于什么类型的过去完成时?
I must apologize for my dog's behaviour last week.You left your bag beside the door.The dog had seen it,he had picked it up and had taken it into the garden.The next time you are in the village,please come and have a free meal.
Q1:The dog had seen it he had picked it up and had taken it into the garden.此句为什么用过去完成时
Q2：如用一般过去时是否可以
这是新2练习册的答案 我也觉得用过去完成时很.

答案

我觉得这里用一般过去式更好.因为过去完成时用于一个过去的时间或动作之前.但这几个动作显然发生在前句You left your bag beside the door.这个动作之后.所以不构成使用过去完成时的条件.并且前面有last week这个一般过去式的时间状语,所以这里用一般过去式更好.
补充：我们就坚持真理吧.