1被动语态
灾祸不好的 用被动语态
2被动转主动
Two banks have been robbed by the same man in the ....
The homework was assigned by the teacher.
by them
An old man was heard ...
The article has finally been finished.
The sperading of nuclear weapons must be prohibited.
It is+过去分词+that从句
It is said that US dollars will continue to depreciate.
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