摘要：31．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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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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