2. 职业资格
  3. Potential subjects should be informed of the research and______ an opportunity to decide if they want to participate.

Potential subjects should be informed of the research and______ an opportunity to decide if they want to participate.

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问题 Potential subjects should be informed of the research and______ an opportunity to decide if they want to participate.
选项 A、gave
B、giving
C、give
D、be given
答案D
解析 考查动词的语态。后半句的主语是代词they，谓语动词是give，根据句意应是“他们被提供机会决定是否要参与研究”，故用被动语态。
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