I had just stepped out of the bathroom and was busily drying myself with a towel _______ I heard the steps．

1. A.
   while
2. B.
   when
3. C.
   since
4. D.
   after

35. I had just stepped out of the bathroom and was busily drying myself with a towel ____ I heard the steps.

A. while          B. when          C. since           D. after

 I had just stepped out of the bathroom and was busily drying myself with a towel________ I heard the stops.

     A. while         B. when          C. since         D. after      

I had just stepped out of the bathroom and was busily drying myself with a towel ______ I heard the steps.

A. while       B. when       C. since      D. after

 I had just stepped out of the bathroom and was busily drying myself with a towel __________ I heard the steps.

A. while        B. when     C. since        D. after