＿＿their differences，the couple were developing an obvious and genuine affection for each other．
A. But for
B. For all
C. Above all
D. Except for
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A. But for
(答案→)B. For all
C. Above all
D. Except for
解析：句中的their differences，obvious and genuine affection可确定选项中的转折词只能是for all，意思是“尽管”。