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

解析本题意为“参加实验的人员完全是被随意地挑选出来的”。C项“at random任意地，随机地”符合题意。其他三项at length“最后，长时间地”，in essence“本质上”，in bulk“散装，大量”都不正确.

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