题目

The old couple have been married for 40 years and never once ________ with each other. A. they had quarrelled   B. they have quarrelled C. have they quarrelled  D. had they quarreled 答案:C 解析: C。由否定意义的词never once开头,句子用部分倒装;前一并列分句已经提示要用现在完成时态。
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