Although Japanese encephalitis often results in only mild symptoms, in a small percentage of instances its symptoms are so severe and intractable that one in four such cases is fatal.
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Aits symptoms are so severe and intractable that one in four such cases
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Bit is of such severity and intractability, one in four cases
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Cso severe and intractable it is such that one in four cases
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Dsuch is its severity and intractability, one of four cases
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Ethere is so much severity and intractability that one of four such cases
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正确答案: A