Although it was so cold,_____he went out without an overcoat A.but B.and C.so D.\选哪个?为什么?

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$Although it was so cold,_____he went out without an overcoat A.but B.and C.so D.\选哪个?为什么?$

Although it was so cold,_____he went out without an overcoat A.but B.and C.so D.\选哪个?为什么?
Although it was so cold,_____he went out without an overcoat A.but B.and C.so D.\
选哪个?为什么?

Although it was so cold,_____he went out without an overcoat A.but B.and C.so D.\选哪个?为什么?
选D although不能和but连用