英语中过去完成进行时的结构
问题描述：
英语中过去完成进行时的结构
答
过去完成进行时：had been doing
例：The old clock had been being taken apart of and fixed up again for several times by my 10-year old son before I came back home.（我回到家之前,我10岁大的儿子已经把这个旧钟表拆卸并重新组装了好几回了