______can be seen from the comparison of these figures, the principle involves t

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问题 ______can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of his condition.

选项 A、As
B、What
C、That
D、It

答案 A

解析 定语从句。as引导非限制性定语从句可以放在主句之前,指代主句的内容,而which只能放在主句之后,故答案为A。
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