The roommates have lived for three years and not once _____with each other.

       A. they had quarreled            B. they have quarreled  

C. have they quarreled           D. had they quarreled

The roommates have lived for three years and not once _____with each other.

1. A.
   they had quarreled
2. B.
   they have quarreled
3. C.
   have they quarreled
4. D.
   had they quarreled

The roommates have lived for three  years and not once _____with each other.

       A. they had quarreled            B. they have quarreled  

C. have they quarreled           D. had they quarreled