At times they have been shamefully neglected.
有时他们被可耻地忽略了。
The marshes have been drained.
沼泽地里的水已排干。
Your trip must have been fun!
你这次旅行一定很开心吧！
have been是什么时态什么语态
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At times they have been shamefully neglected.
有时他们被可耻地忽略了。
The marshes have been drained.
沼泽地里的水已排干。
Your trip must have been fun!
你这次旅行一定很开心吧！