What does the passage mainly discuss? It can be inferred from the passage that one reason that sociologists may become frustra

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问题  What does the passage mainly discuss?
  It can be inferred from the passage that one reason that sociologists may become frustrated with questionnaires is that

选项 A、respondents often do not complete and return questionnaires
B、questionnaires are often difficult to read
C、questionnaires are expensive and difficult to distribute
D、respondents are too eager to supplement questions with their own opinions

答案A

解析
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