You sure can review your return, just be sure to be signed into your 2017 tax return. Because each fiscal year in the online version of the software has its own web page.
If you used TurboTax Online last year, sign in to TurboTax Online for the tax year 2017 here: https://ww1.2017.turbotaxonline.intuit.ca/. If you used TurboTax CD/Download and you saved it on your computer you can simply go to the Start button on the bottom left of your screen and click on Start and you will see a small search bar - type in .tt17 and you will find it there. If you did not save it, unfortunately, there is not a way to access it.