The old couple have been married for 40 years and never 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 old couple have been married for 40 years and never once ________ with each other.

A. they had quarrelled   B. they have quarrelled

C. have they quarrelled  D. had they quarreled

The old couple have been married for 40 years and never once ______ with each

Other.

A．they had quarreled                      B．they have quarreled

C．have they quarreled                     D．had they quarreled

The old couple have been married for 40 years and never once _______ with each other.

   A. they had quarreled             B. they have quarreled

C. have they quarreled            D. had they quarreled