The people for the experiment were chosen completely ______.

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问题 The people for the experiment were chosen completely ______.

选项 A、at length
B、in essence
C、at random
D、in bulk

答案C

解析 at random任意，随机地。句意：参加实验的人员完全是被随意地挑选出来的。at length最后，详细地；in essence本质上；in bulk散装，大量。

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