The old couple married for 40 years and never once with each other. A. they had quarreled.

问题补充：

The old couple 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.

答案：

A. they had quarreled.

B. they have quarreled

(答案→)C. have they quarreled

D. had they quarreled.

解析：句意：这位老夫妻结婚40年了，他们从来没吵过一次架。考查never表否定时，位于句首,引起部分倒装的结构。