题目内容：

the old couple have been married for 40years and never once ( )with each other .A they had quarrel
the old couple have been married for 40years and never once ( )with each other
.A they had quarreled
B they have quarreled
C have they quarreled
D had they quarreled .

优质解答

C,这个前面是never.否定词句首要用倒装,所以排除A,B.这个题是说这对老夫妻从没吵过架,所以用现在完成时,一直到现在.所以选C