Alice, bent ______ losing weight, increased the time of exercise to three hours______ a time.

1. A.
   on; in
2. B.
   on; for
3. C.
   with; for
4. D.
   with; at

Alice, bent ______ losing weight, increased the time of exercise to three hours ______ a time.

A. on; at　　 　 　　B. on; for　　 　　　 C. with; for　　 　　D. with; at

  Alice, bent ______ losing weight, increased the time of exercise to three hours______ a time.

Alice, bent ______ losing weight, increased the time of exercise to three hours ______ a time．

A． on; at         B． on; for       C． with; for      D． with; at