Her favorite notebook ,( ),was missing A but B however C though D still

问题描述:

Her favorite notebook ,( ),was missing A but B however C though D still
要分析与翻译的

A但是 B然而C尽管D仍旧.括号内的应该是填b,表转折,虽然but 也有表转折的意思,但好像不可以位于逗号之间,但however可以.was missing 是啥意思丢失了