◎ 题干
The old couple have been married for 40 years and never once _____ with each other.
[     ]
A. they had quarreled
B. they have quarreled
C. have they quarreled
D. had they quarreled
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The old couple have been married for 40 years and never once _____ with each other. [ ]A. they had quarreledB. they have quarreled C. have they quarreled D.…”主要考查了你对  【现在完成时】【部分倒装】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。