The people for the experiment were chosen completely______ random.

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问题 The people for the experiment were chosen completely______ random.

选项 A、at
B、in
C、by
D、on

答案A

解析句意：参加实验的人完全是随机挑选的。at random意为“任意地，随便地”，因此正确答案是A选项。

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