Strikethrough is available under Effects and the shortcut for it is Alt + K. To quickly recap, the second shortcut is Ctrl + D and then Alt + K.
for instance, What is the command for Strikethrough on Mac?
Open your Pages document. Select the text to receive Strikethrough, and then press control S. Set it up as Viking advises, however the standard Office shortcut is command shift x. Best to stick to that.
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