Simple app for making Question answer pair table that could be exported in csv format?
In LibreOffice Calc, press F2 and then paste. This is similar to your answer in the comments but uses an extra keystroke instead of double-clicking.
Alternatively, a reliable 2 key combination method is to press Ctrl+Shift+V and then Enter to paste unformatted.
In Writer, this can be done with a single key combination, Ctrl+Shift+Alt+V. However, Calc seems better suited to your needs, and this combination does not work in Calc.
Note that on Windows, no import dialog is displayed. Instead, it is pasted as HTML instead of plain text by default.