单选题 ________can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of his condition.
【正确答案】 B
【答案解析】从这些数字的比较中可以看出,这一原则涉及患者积极参与病情的改善。本题考查as引导的非限制性定语从句,相当于which,放在了句首,as代指的是整个句子,选项A,C,D不符合,故选B。