作业帮They have to sleep before ten.(变为否定句,一般疑问句并作否定回答)
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They have to sleep before ten.(变为否定句,一般疑问句并作否定回答)
They have to sleep before ten.(变为否定句,一般疑问句并作否定回答)
They have to sleep before ten.(变为否定句,一般疑问句并作否定回答)
They do not have to sleep before ten.