The two old friends werebusywith each otherthe time.Yes. They haven’t met for long

问题补充：

--- The two old friends werebusywith each otherthe 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：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。