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It______on the Internet with respondents who volunteered to participate, and was
It______on the Internet with respondents who volunteered to participate, and was
游客
2024-10-14
30
管理
问题
It______on the Internet with respondents who volunteered to participate, and was not a scientifically random survey.
选项
A、were conducting
B、were conducted
C、had been conducted
D、had conducted
答案
C
解析
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