摘要: A: What is he doing? B: .
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— What is he doing?
— He ____________ back to class.
— He ____________ back to class.
[ ]
A. runing
B. running
C. is running
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B. running
C. is running
What is he doing? ___________ 
[ ]
A. He is reading a book.
B. He is writing on the paper.
C. He is playing football.
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B. He is writing on the paper.
C. He is playing football.