这个是独立主格问题?________twice,the postman refused to deliver our l

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这个是独立主格问题?
________twice,the postman refused to deliver our letters unless we chained our dog.
A.Being bitten B.bitten
C.Having bitten D.To be bitten
A项是否表示正在被咬?选择C的话应该+ been
还有啥情况可以用过去分词放在句首?
_______,by the advances in technology,many farmers have set up wind farms on their land.
A.Being encouraged B.Encouraging
C.Encouraged D.Having encouraged
A项是否表示正在被鼓励?
把A项怎么改才能变成独立主格结构?改后的独立主格结构的doing形式的话,表原因用.
还有,到底啥情况可以用过去分词放在句首?
8个选项的首字母都大写的。我打错了

你分析得很好呀.
类似的还有.
Heard by many times, this song is really the one that I want to sing to you at this moment.
我很想把这首我听过许多次的好歌送给你.
还有很多类似的.
Caught by many times, this man still live a life as a thief.

这个是独立主格问题?________twice,the postman refused to deliver our l 过去分词作状语问题1.—————— twice,the postman refused to deliver our l ____twice,the postman refused to deliver our letters unless Bitten twice,the Postman refused to deliver our letters unle __twice,the postman refused to deliver our letters unless we ____twice ,the postman refused to deliver our letters unless ---------- twice,the postman refused to deliver our letters ___twice,the postman refused to deliver our letters unless w （）twice ,the Postman refused to deliver our letters unless 英语选择.-------twice ,the postman refused to deliver our letter 1.___ twice,the postman refused to deliver our letters unles ___twice ,the postman refuse to deliver our letters unless w