have been done是什么时态

回答

瑞文问答

2021-08-27

have been done是现在完成时的被动结构。
例句：
Trivial formalities have been done away with.
繁琐礼节都取消了。
What could have been done better?
有哪些本可以做的更好？

扩展资料

　　It could have been done carefully.

　　它可能被小心地搜寻过。

　　But no studies have been done in WOMEN.

　　但没有对女人进行的'研究。

　　The same studies have been done in Asia.

　　同样的研究也在亚洲。