问题

The old couple have been married for 40 years andnever once ______ with eachOther.
A:they had quarreled
B:they havequarreled
C:have theyquarreled
D:had theyquarreled
B:they havequarreled
C:have theyquarreled
D:had theyquarreled
正确答案是: