问题补充:
--- The two old friends were busy with each other the time.
--- Yes. They hadn’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,我们很久不见了。短语be busy doing忙着做某事,结合语境可知选D。