Question

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

Answer 1

答案C
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。