Twenty students were chosen___to take part in the experiment A.by accident B .one handC.in practice D at random为什么不是C?

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Twenty students were chosen___to take part in the experiment A.by accident B .one handC.in practice D at random为什么不是C?
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Twenty students were chosen___to take part in the experiment A.by accident B .one handC.in practice D at random为什么不是C?
Twenty students were chosen___to take part in the experiment A.by accident B .one hand
C.in practice D at random
为什么不是C?

Twenty students were chosen___to take part in the experiment A.by accident B .one handC.in practice D at random为什么不是C?
二十个学生被随机的选出.
at random随机的,任意的
in practice 实际上

I felt deeply that the school days were really nice to me. I could a advertisement n goodbye (bye-bye) interj R advice n goose (pl.

at random意思是随机,为什么会选in practice不和语义

in practice 意思是‘实际上’。at random意思是‘随意地’。根据句意应选D.

按照常理,实验结果的精确性与实验对象的选取密切相关。为了保证实验结果具有说服力,实验对象都应该“随意”,“随机”选取。如果带了个人喜好或是色彩就会失去意义。