摘要： The old couple have been married for 50 years and never once with each other. A. they had quarreled B. had they quarreled C. they have quarreled D. have they quarreled
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The old couple have been married for 50 years and never once with each other．
A．they have quarreled B．they quarreled
C．have they quarreled D．had they quarreled
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