It was a small room, it afforded a fine view of the old city.A. so B. forC. orD. but

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A. so
B. for
C. or
(答案→)D. but
解析：D考察连词。句义：虽然这个房间很小，但是从这里可以看见这个老城美丽的风光。题干中的a small room与a fine view可知，此处有转折的意味。故but正确。