The old couple have been married for 40 years and never once ________ with each other．
A.they had quarreledB.they have quarreledC.have they quarreledD.had they quarreled在线课程C
解析：
此题题意是“这对老夫妻四十年来，两人从来没吵过嘴”。本句的时态是完成时。根据and这个并列连词应该首先考虑的是完成时，再从never once所引导的句子结构来分析，应该用完成时的倒装形式，所以C项是最佳答案。