问题补充：
The old couple 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：
A. they had quarreled.
B. they have quarreled
(答案→)C. have they quarreled
D. had they quarreled.
解析：具有否定意义的副词放在句首时，一般采用倒装句(谓语前置)。这类表示否定意义的词有never，seldom，scarcely，little，few，not，hardly，以及not only…but(also)，no sooner…than，hardly…when，scarcely…when等等。
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