It______on the Internet with respondents who volunteered to participate, and was not a scientifically random survey.

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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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专业英语四级

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It______on the Internet with respondents who volunteered to participate, and was not a scientifically random survey.

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