I understand why Victorians are very concerned by the government announcing yesterday that it wants to extend the emergency powers for another 12 months.
卫报中看到的一个句子。请问句子中的by是什么用法?修饰的是understand还是be concerned?
感谢指点
by介词短语修饰表语形容词concerned,表示原因,因...而担忧。
be concerned about/for/over/at/by sth.
the government announcing yesterday that it wants to extend the emergency powers for another 12 months. 为动名词复合结构作介词by的宾语。
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