Would it be correct to use the question mark as it is written in the following sentence? "If your cousin invites you to visit—and why would he not?—I will expect your return after only nine days."
Learn English – em dashes and question marks
dashesem-dashpunctuationquestion markwriting-style
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Best Answer
According to The Chicago Manual of Style, sixteenth edition (2010), it is acceptable to position a question mark immediately in front of a closing em dash. Here is Chicago's entry on this topic:
The Oxford Guide to Style (2002), at 5.8.1, concurs:
And Words into Type, third edition (1974), without referring explicitly to dashes, also agrees:
The three example sentences cited above are syntactically indistinguishable from your example:
So multiple style guides view this form of punctuation as lying within the pale of acceptable usage.