both of her parents are doctors,改为否定句,即both of 可以改为什么?两个空,其它不变,仍旧是are
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both of her parents are doctors,改为否定句,即both of 可以改为什么?两个空,其它不变,仍旧是are
Neither of her parents are doctors.
None of her parents are doctors.
neither of her parents are doctors