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按照要求进行句型转换。 1. She is doing her homework. (改为否定句) She __________ __________ her homework. 2. They are looking at the blackboard. (改为一般疑问句) __________ __________ __________ at the blackboard? 3. Tom is playing basketball . (对画线部分提问) What __________ __________ __________?