【题目】Helen Keller could speak and write. (改为否定句)
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【答案】Helen Keller couldn't speak and write.
【解析】
句意：海伦·凯勒会说话和写字。改为否定句应该在could后边加not，缩写为couldn't。海伦·凯勒不会说话和写字。Helen Keller couldn't speak and write.故答案为Helen Keller couldn't speak and write.
