【单选题】The people for the experiment were chosen completely ______.
A.at length
B.in essence
C.at random
D.in bulk
网考网参考答案:C
网考网解析:
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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