Potential subjects should be informed of the research and __________an opport...

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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9ive，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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