Theroommateshavelived&

Theroommateshavelivedforthreeyearsandnotonce_____witheachother.A.they had quarreledB.they have quarreledC.have they quarreledD.had they quarreled

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C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