He has finished his leason already.(改为否定句) He ___ finished his leason ____.
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He has finished his leason already.(改为否定句) He ___ finished his leason ____.
He has finished his leason already.(改为否定句) He ___ finished his leason ____.
He has finished his leason already.(改为否定句) He ___ finished his leason ____.
hasn't..yet