Some scientists think there is water on Mars.(改为否定句)

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SomescientiststhinkthereiswateronMars.(改为否定句)SomescientiststhinkthereiswateronMars.(改为否定句)Somescient

Some scientists think there is water on Mars.(改为否定句)
Some scientists think there is water on Mars.(改为否定句)

Some scientists think there is water on Mars.(改为否定句)
Some scientists don't think there is water on Mars.