问题
选择题
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
答案：C
本题考查倒装结构。and后面的句中，句首有否定词never，故句子要主谓倒装，再根据never用现在完成时。句意：老夫妇已经结婚40年了，彼此从未一次吵过。