We were sitting in a cafe in the city,——hot coffee to try to

选C
后面半句做伴随状语,表示伴随动作,其实伴随状语就是由主语发出动作的伴随状态,情况或动作.它通常由形容词,现在分词,过去分词来充当.

例如：
They came out of the classroom,talking and laughing.(后面的talking and laughing是伴随状语)