Potential subjects should be informed of the research and _________

初中英语

单选题 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：D进入在线模考

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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