The roommates have lived for three years and not once _____with each other.
A．they had quarreledB．they have quarreled
C．have they quarreledD．had they quarreled
C
該題結合倒裝結構、考查動詞時時態(tài)的用法。根據(jù)并列句時態(tài)一般保持一致的原則，可以排除選項A、D；根據(jù)not這個否定副詞放在第二個分句之首可知該句要倒裝。因此該題最佳答案為C。
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