so many birds _____ for no reason ,the local people organize

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so many birds _____ for no reason ,the local people organized to protect birds
答案是killed为什么不是had been killed或是were killed

如果用had been killed或是were killed那前一部分就是个句子了,可是两句话之间没有【并列连词】,所以不行!
这要从句子类型这个角度去看：
1,简单句
so many birds killed for no reason 是【独立主格结构】（这里是名词+过去分词）作时间状语,整个这句话是简单句
2.并列句（没有并列连词,这是不能用had been killed或是were killed的原因）
3.主从复合句（没有引导从句的从属连词）
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