Whatever is left over may be put into the refrigerator, ________ it will keep for two or three weeks．

1. A.
   when
2. B.
   which
3. C.
   where
4. D.
   while

Whatever is left over may be put into the refrigerator , _____ it will keep for two or three weeks.

A. when　　 B. which　 C. where　 D. while

Whatever is left over may be put into the refrigerator, _____ it will keep for two or three weeks.

A. when　 　 B. which　 　 C. where 　 D. while

 Whatever is left over may be put into the refrigerator, ________ it will keep for two or three weeks.

   A. when    B. where    C. while    D. which

Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.

A．when         

B．which  

C．where       

D．while