From the old days, I was taught to use nor this way:
"They don't know how to do x nor do they know how to do y."
, the correct answer of the question says "They don't know how to X or how to Y."
One of the incorrect answer choices is "They don't know how to X nor how to Y."
I'm wondering why the nor answer choice is incorrect. Obviously, the structure is different than what I learned in the old days.
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