The roommates have lived for three years and not 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：该题结合倒装结构、考查动词时时态的用法。根据并列句时态一般保持一致的原则，可以排除选项A、D；根据not这个否定副词放在第二个分句之首可知该句要倒装。因此该题最佳答案为C。