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Yes, you can still file 2017 and should file them.
You actually have three years from due date to file and still get a refund.
You cannot however use the online and e-file the 2017, as you must use prior year software and the 2017 will have to be mailed in.
You can e-file the 2018 today and then do the 2017 return. The order does not matter.
For prior year software click this link. https://turbotax.intuit.com/personal-taxes/past-years-products/
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