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I think Google is spidering our adwords and not replacing the %3F with a? and %3D with an =. The %20 means there's a space in a URL. It could be a broken link to your site that Google is trying to access. Just make sure you have a custom missing.html page on your site and it should be ok.
I have a friend who was getting a lot of requests for a page called /contact.htm%20 which always failed. Using google to search for domain.com/contact.htm%20 quickly located the offending page and site. It was simply someone with a dodgy cut and paste when they made the links on their page.
They had a: <a href="http:www.domain.com/contact.htm ">
instead of: <a href="http:www.domain.com/contact.htm">
A short email to the site owner resulted in the link being fixed in a few days.