The old couple have been married for 40 years and never once ________ with each other.
A．they had quarrelledB．they have quarrelled
C．have they quarrelledD．had they quarreled
C

C。由否定意義的詞never once開頭，句子用部分倒裝；前一并列分句已經(jīng)提示要用現(xiàn)在完成時(shí)態(tài)。
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