______(shock) at the sad news,my aunt stood there silently,not knowing what to say.

问题描述:

______(shock) at the sad news,my aunt stood there silently,not knowing what to say.
这里要填什么,为什么?

Shocked
原因状语从句,表示被消息震撼到了,用被动形式那为什么不用be动词?因为是从句,不用be能详细点吗,不懂如果是状语从句,是句子的次要成分,动词用to do或者done或者doing形式,这里是表原因,又是被动,用过去分词形式