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
网友回答
A. they had quarreled
B. they have quarreled
(答案→)C. have they quarreled
D. had they quarreled
解析：本题考查倒装结构。and后面的句中，句首有否定词never，故句子要主谓倒装，再根据never用现在完成时。句意：老夫妇已经结婚40年了，彼此从未一次吵过。