They need not sweep the fioor (today).对括号内提问( )( )they sweep the floor.

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They need not sweep the fioor (today).对括号内提问( )( )they sweep the floor.
They need not sweep the fioor (today).对括号内提问
( )( )they sweep the floor.

They need not sweep the fioor (today).对括号内提问( )( )they sweep the floor.
When needn't

when need they sweep the floor?