I know a lot about public signs.改成否定句I ()()a lot about public signs.

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I know a lot about public signs.改成否定句I ()()a lot about public signs.

I know a lot about public signs.改成否定句I ()()a lot about public signs.
I know a lot about public signs.改成否定句I ()()a lot about public signs.

I know a lot about public signs.改成否定句I ()()a lot about public signs.
don't know