My father and my mother have been married for 30 years, and never once ________ with each other.

A．have they quarreled

B．they have quarreled

C．did they quarrel

D．had they quarreled

My father and my mother have been married for 30 years, and never once ____ with each other.

A．have they quarreled　　　　　　 B．they have quarreled

C．did they quarrel　　　　　　　 D．had they quarreled

My father and my mother have been married for 30 years, and never once ________ with each other

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