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Dudo que sepa qué dice...
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I really doubt if he knows what he is talking about...
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No está claro si los perros reciban tratos tan severos...
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It is debatable whether dogs are so badly treated...
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No estoy seguro de si lo que dice Manuel sea la verdad...
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I'm not sure whether what Manuel says is true...
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Me pregunto si deberíamos tomar en serio su razonamiento...
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I really wonder whether we should take his argument seriously...
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No es necesariamente el caso...
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That's not necessarily the case...
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