____ we drew closer, I could see a whale being attacked by a pack of about six other killers.

A. With　 B. As　 C. While　 D.Until

As we drew closer, I could see a whale ____________ by a pack of about six other killers.

A. attacking         B. being attacked       C. attack       D. to attack

As we drew closer, I could see a whale      by a pack of about six other killers.

1. A.
   attacked
2. B.
   to be attacked
3. C.
   having been attacked
4. D.
   being attacked

As we drew closer, I could see a whale      by a pack of about six other killers.

As we drew closer, I could see a whale      by a pack of about six other killers.