The people for the experiment were chosen completely ______.A、at lengthB、in ess

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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 C项“at random任意，随机地”符合题意。其他三项“A项at length最后，详细地；B项in essence本质上；D项in bulk散装，大量”都不正确。本题意为“参加实验的人员完全是被随意地挑选出来的”。因此C项为正确答案。

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