no students do homework once or twice a week中student为什么加s

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no students do homework once or twice a week中student为什么加s
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no students do homework once or twice a week中student为什么加s
no students do homework once or twice a week中student为什么加s

no students do homework once or twice a week中student为什么加s
no=not a 或者not any ,后面可以加单数、不可数后者名词复数