What do medical researchers usually use to make placebo pills? Placebos may be harmful, because they may be used by ______.

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问题 What do medical researchers usually use to make placebo pills?
Placebos may be harmful, because they may be used by ______.

选项 A、doctors
B、false doctors or deceivers
C、researchers
D、scientists

答案B

解析 见第六段。
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