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

问题补充：

The old couple have 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：never是否定词，以否定词开头的句子要部分倒装。