The letter --- by him hasn't been posted yet A.written B.was writ_英语解答

The letter --- by him hasn't been posted yet A.written B.was written C.is written D.writing

人气：286 ℃　时间：2020-03-20 08:27:06

解答

A
有了by明显是被动态,信是被他写的,排除D
主语letter,谓语hasn't been posted,所以不可能还存在其他的动词或be动词
written by him 是修饰letter的