I have got good news for youYou are to change trains in Changsha and take fast one. A.

问题补充：

I have got good news for you．You are to change trains in Changsha and take fast one.

A. /; /; a

B. a; /; a

C. a; the; the

D. /; the; a

答案：

(答案→)A. /; /; a

B. a; /; a

C. a; the; the

D. /; the; a

解析：句意：我有一个好消息要告诉你。你将在长沙换乘火车，并且将搭乘更快的火车。news为消息，不可数名词，不能用冠词修饰，trains火车，复数名词，不用冠词修饰，a fast one一辆更快的火车，用不定冠词a 修饰，故选A