Though the crew were at first under the impression that the lost ship had been found,the contents of the chest proved th
问题描述：
Though the crew were at first under the impression that the lost ship had been found,the contents of the chest proved them wrong.
were是什么语under the impression that 是什么语?
答
were 是系动词,算是谓语 under the impression 是表语 impression后面应该是同位语从句了