The young man was lying on the grass with his horse _____a tree.

1. A.
   being tied
2. B.
   tied to
3. C.
   tying to
4. D.
   was tied to

  The young man was lying on the grass with his horse _____a tree.

A. being tied     B. tied to   C. tying to   D. was tied to

  The young man was lying on the grass with his horse _____a tree.

  The young man was lying on the grass with his horse _____a tree.