问题补充：
They were when they heard the news.
A. excited, exciting
B. exciting, excited
C. excited, excited
D. exciting, exciting
答案：
(答案→)A. excited, exciting
B. exciting, excited
C. excited, excited
D. exciting, exciting
解析：句意：他们听到这个令人兴奋的消息都很兴奋。Excited意为“感到兴奋的”，用来描述人的感受；exciting意为“令人兴奋的”，用来描述事物的性质；故选A。
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