make sth to the public,表示“告知公众、让公众知道”
to the public这里可以先忽略,
They haven't made it where they are to hold the conference.
they主语,haven't made谓语,it形式宾语,where引导的句子是真正的宾语.
如果把形式宾语去掉：
They haven't made [where they are to hold the conference] to the public.
"他们还没有告知公众,将要在哪里召开大会."
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