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。