您好,很高兴为您
The government keeps the people in the dark about it. 关于这件事,政府不想让人们知道.
The government 主语
keeps 谓语
the people 宾语
in the dark 宾补
about it 状语
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-------------------------------这里in the dark是介词短语作宾语补足语吗？是的

能带宾语补足语的动词常见的有make,keep,find.think,name,call,hear,seem,leave等

We found the girl in the room in the room就是借此短语作宾补