when i arrived at the station yesterday,Mary was waiting for me .She was wearing a bluewhen I arrived at the station yesterday,Mary was waiting for me .She was wearing a blue dress and looked very perrty.不解之处：1.这里She was wearing a blue dress 用了过去进行时,为什么不能用过去时呢?用wore.2.如果She was wearing a blue dress用了过去进行时的话 ,后面也应该跟过去进行时,因为有and 连接.按这样来说 这句话就是错的了,可以这样理解吗 、
问题描述：
when i arrived at the station yesterday,Mary was waiting for me .She was wearing a blue
when I arrived at the station yesterday,Mary was waiting for me .She was wearing a blue dress and looked very perrty.
不解之处：
1.这里She was wearing a blue dress 用了过去进行时,为什么不能用过去时呢?用wore.
2.如果She was wearing a blue dress用了过去进行时的话 ,后面也应该跟过去进行时,因为有and 连接.按这样来说 这句话就是错的了,可以这样理解吗 、
答
前面用进行时表示一种状态
后面look表示“看起来怎样时”是不及物动词（vi）
答
1.was wearing表示她当时的状态,而wore表示动作发生在过去,因此选ing形式
2.你的理解是错误的,后面这句话应该是这样的,she was wearing a biue dress.And she looked very pretty,只是分开写句子稍显繁冗,因此合并为一句.