幾道sat語法題求解

I will always remember (you) standing by me offering me encouragement.
you改your,為什么you不可以?you作賓語,standing by 和offering 作賓補

   2.In 1986,a radiation lasts for the better part of a year.
       這個是改編的,這里的better part of a year要怎么翻譯?
   3.Because of the storm,the farmers are doing half of the business that they are doing (previous) to the land.
       這題也是改的,previous沒錯,但為什么改previously不行?修飾doing
  4.（Was） （it） （they） who were involved in last week's （unruly） demonstration?
      答案是句子沒錯,it they這三個是什么成分,我覺得是Were they who..