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

A.gave
B.giving
C.give
D.be given

参考答案

参考解析
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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