title: johnpaintedhersittinginachairwit? 
desc: john paint her sitting in a chair with her hands ___.
  A.folding    B  to have foled    C  to fold    D  folded
  答案是D。。 为什么不是A表示伴随呢?
  谢谢了
answer: 过去分词表被动，然后理清主动还是被动，主动用ing,被动用过去完成时
  如：jion is playing football with his homework down.
      [ 作业被做完]
      join is playing football with his sweat running。
     ｛流汗是主动｝