The two old friends were busy with each other the time.Yes. They haven’t met for

问题补充：

--- 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

答案：

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：too ……to太……而不能；so……that如此……以至于。句意：这两个老朋友忙着说话，以至于忘了时间。——是的，他们很久不见了。短语be busy doing忙着做某事，结合语境可知选D。