1 ——,we all went home happily A goodbye was said B goodbye h

1 ——,we all went home happily
A goodbye was said B goodbye had been said C goodbye said D when goodbye said
选C.
good-bye said是独立主格结构,它可以在句中当状语.相当于：
When good-bye was/had been said或When we (had )said good-bye
如果用A或B,两个完整的句子,要用连接词连接.
D没用被动语态.