There is plenty of rain in the south _______ there is little in the north.?

A. while  B. as?

C. when  D. so?

There is plenty of rain in the south__________there is little in the north.?

A.while                 B.as                      C.when                 D.so?

There is plenty of rain in the south ________ there is little in the north.

1. A.
   while
2. B.
   as
3. C.
   when
4. D.
   so

There is plenty of rain in the south ________ there is little in the north.

[　　]

A. while 　　　　　　   B. as 　　　　　　　　   C. when 　　　　　　　　　　 D. so