Mary has only just recovered from a serious(ill)_
问题描述：
Mary has only just recovered from a serious(ill)_
答
玛丽才刚刚痊愈，严重（病）_
答
illness 名词， 赞同二楼的解释
答
illness.只要看后面from a serious(ill).serious是形容词,后面就转换为ill的名词形式
Mary 刚从严重的疾病中恢复过来
答
illness