问题
选择题
They were ________ busy ________ with each other ________ the time.
A．too; talking; to forget
B．so; talking; that they forgot
C．so; to talk; that they forgot
D．too; to talk; to forget
答案
答案：B
题目分析：句意：他们忙于相互交谈以致忘了时间。Be busy doing sth忙于做某事；too···to太···而不能。So···that如此···以致。所以选B。