By the year 1889, there were just 541 bison ________ in the whole of North America.

By the year 1889, there were just 541 bison       in the whole of North America.

     A. leaving alive          B. to leave alive            C. to be left alive           D. left alive

By the year 1889, there were just 541 bison ________ in the whole of North America．

1. A.
   leaving alive
2. B.
   to leave alive
3. C.
   to be left alive
4. D.
   left alive

 By the year 1889, there were just 541 bison ________ in the whole of North America.

   A. leaving alive                                 B. to leave alive   

C. to be left alive                             D. left alive

By the year 1889, there were just 541 bison       in the whole of North America.

     A. leaving alive       B. to leave alive         C. to be left alive        D. left alive