The old couple have been married for 50 years and never      with each other
A．they had quarreledB．they have quarreled
C．have they quarreled D．had they quarreled
C
考查倒裝句，否定詞放在句首使用部分倒裝。根據(jù)時態(tài)要前后保持一致，前半句是現(xiàn)在完成時態(tài)，后半句應(yīng)該也是現(xiàn)在完成時態(tài)，never放在句首，使用部分倒裝，所以選C。
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