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

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

admin2013-03-23  65
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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