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
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
C
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。