I think I've seen all these styles:
1. em dash everywhere:
His thoughts were confused—he had been drinking—and he did not answer. I would like to kn—
2. double em dash at the end (making sure there's no gap between them):
His thoughts were confused—he had been drinking—and he did not answer. I would like to kn——
3. spaced en dashes in the middle, unspaced em dash at the end
His thoughts were confused – he had been drinking – and he did not answer. I would like to kn—
I like 1 or 2 better, but sometimes 3 is more practical (when the reader does not break lines at an em dash).
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