To understand why people are paying something for nothing, you also need to understand the phenomenon known as the placebo effect (安慰剂效应), ______ a sick person shows signs of improvement after taking drugs that actually have zero medical benefit.
| A．in which | B．to which | C．on whom | D．to whom |
更新时间：2023-11-18 20:45:55
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【知识点】 “介词+关系代词”引导的非限制性定语从句
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