had been done是什么时态s
回答
爱扬教育
2022-03-22
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had：v. 有; 持有; 占有; 由…组成; 显示出(性质、特征)。
been：v. 曾经; 曾经到过(某地)。
done：adj. 完毕; 了结; 结束; 煮熟; 熟了; 合乎礼仪; 合乎规矩; 得体。
扩展资料
She knew it would be difficult to undo the damage that had been done
她知道想要消除已经造成的损害是很难的。
The work had not been done very thoroughly.
这工作做得不太认真。
Making time to talk over what had been done.
腾点时间谈谈已做的工作。
Therefore, three studies had been done to explore those questions above.
为此，本论文通过三项研究对上述问题分别进行了探讨。
By the end of last month, all the work had been done.
到上个月末为止，所有的工作都完成了。