题目内容：
The researchers have conducted an experiment to prove that people will act in emergencies when ______
A) they are in pairs
B) they are in groups
C) they are alone
D) they are with their friends
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：The researchers have conducted an experiment to prove that people will act in em
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- 题目类型：选择题
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