问题
选择题
The passengers’ (乘客) families were to keep calm as soon as they heard the bad news.
A．too sad
B．sad enough
C．enough sad
D．so sad
答案
答案：A
题目分析：句意：乘客的家人一听到坏消息，太伤心了以致于不能保持冷静。too…to…太……以致于不能做某事；enough to do足以做某事；so…that如此……以致于……。根据句意，选A。