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答案：
A
主语是 Debor
ah Sampson这个人，题目中的几个动词，joined， was injured和 was discharged都是对她的生平的过程的概述，并列，所以动词形态也应该一样，发生在过去所以用过去式joined， was injured和 was discharged，排除BE。选项C句子成分不完整；选项D，受伤应该是 was injured,排除D；变得过于虚弱继续服役是在退伍之前，也是退伍的原因之前，发生在过去的过去，用过去完成时，选A. 
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