--- The two old friends were busy with each other the time.
--- Yes. They haven’t met for long.
A. too, to talk; to forget
B. too, talking; to forget
C. so, to talk; that they forgot
D. so, talking; that they forgot
网友回答
A. too, to talk; to forget
B. too, talking; to forget
C. so, to talk; that they forgot
(答案→)D. so, talking; that they forgot
解析：短语too……to太……而不能；so……that如此……以至于；be busy doing忙着做某事。句意：这两个老朋友是如此忙着和彼此聊天，以至于他们忘记了时间。结合语境可知选D。