问题描述:
句型转换:1.they are doing housework.(分别改成一般疑问句和否定句)
2.the students are cleaning the classroom.(改为一般疑问句并作否定和肯定回答)
2.the students are cleaning the classroom.(改为一般疑问句并作否定和肯定回答)
问题解答:
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