May I go there?: I often thought, of this.
I think: I have, maybe, seen: some two punctuations, in, some, books. May you get to use this, in proper, grammatical, English grammar?
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You'll see all sorts combinations of dashes, question marks and exclamation marks in very casual writing, but in formal writing you will find two points together only when
a quoted passage bracketed in quotation marks is concluded with a point
"So there!" she said.
a supplementary phrase bracketed in parentheses or dashes is concluded with a full stop, question mark or exclamation mark:
I am told—should I believe it?—that quite reputable authors disparage the use of the Oxford comma.
a dash introducing a comment follows an assertion concluded with a question mark or exclamation mark:
He claims to have seen it himself? —I am dubious.
But these last two are markedly conversational, if not altogether colloquial.