【题目】The old couple have been married for 40 years and never once ________.
A. they had quarreled B. they have quarreled
C. have they quarreled D. had they quarreled
在线课程【答案】C
【解析】试题分析：考查倒装句。句意：那对老夫妻已经结婚40年了，从来都没有争吵过。本句中的否定词never放在后面的句首，后面使用部分倒装的形式。根据前面的for 40 years说明使用现在完成时。故选C。