This has been asked and the Gapfill plugin type was the answer then, but just to clarify: is it so that the basic Drag and drop into text question type can't have multiple correct answers in one slot?
That is the case.
In reply to Samuli Karevaara
Re: Drag and drop into text: multiple correct answers?
by Marcus Green -
For anyone who has not seen that I assuming it is using Gapfill with the bar/or operator as in The cat sat on the [mat|hat|rug] approach?