.Few people paid full attention to their health conditions _____ they were seriously ill.

A. when     B. if              C. until        D. before

Few people paid full attention to their health conditions ________ they were seriously ill.

1. A.
   when
2. B.
   if
3. C.
   until
4. D.
   after

 Few people paid full attention to their health conditions _____ they were seriously ill.
A. when               B. if                    C. until                       D. before

Few people paid full attention to their health conditions _____ they were seriously ill.

A. when 　　 B. if 　　　 C. until 　　　 D. before

Few people paid full attention to their health conditions _____ they were seriously ill.
A. when    B. if     C. until     D. before