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3. They are doing housework .(分别改成一般疑问句和否定句)
①_______________________________________________
②_______________________________________________
4. My mother is cooking some nice food now. ( 改一般疑问句并作肯定和否定回答)
①_______________________________________________
②_ ___________________________________
③_____________________________
5.The students are cleaning the classroom . ( 改一般疑问句并作肯定和否定回答)
①_______________________________________________
②_ ___________________________________
③_____________________________
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