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Ctrl+⇧ Shift+T (Windows) or ⌘ Command+⇧ Shift+T (Mac). This will open the last tab that you closed. You can keep pressing this to continue opening closed tabs in order. You can right-click on an open tab and select "Reopen last closed tab" to accomplish the same thing. This will display a list of all of your recently-closed tabs. Click on any of the tabs in the list to open it in a new tab.
Press . Click the Opera menu and select "Recent Tabs".