When people suffer from Alzheimer’s disease, ______.

参考解析：

细节理解题。根据第三段最后一句“This progressive disease generally lasts 8 to 10 years before death occurs.”可知，这种疾病在死亡发生之前通常会持续8到10年，而不是一定会，故A项错误。根据倒数第二段第三句“If the spouse develops the disease, you may experience hurt and disappointment when he or she doesn’t remember you are married.”可知，患者也会忘记自己的配偶，故B项错误。文章并没有提到C项的内容。根据文章倒数第二段第三句“If the spouse develops the disease, you may experience hurt and disappointment when he or she doesn’t remember you are married.”可知，患者的家属会遭受各种精神折磨。故选D。