问题
选择题
The old rules have to be _____because they only applied to the circumstances that existed when they were made a hundred years ago.
A．developed
B．established
C．observed
D．revised
答案
答案：D
题目分析：句意上，老的规则需要被修改因为它们只适合一百年前的状况。A项表示“培养，发展”；B项表示“建立”；C项表示“观察”而D项正是“修改”之意，故选D。
