After some experiments, the doctors found that ______.

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A. the influenza could be cured like other types of influenza

B. the influenza must be treated in a special way

C. the influenza did not have to be treated

D. the influenza could not be cured by any known medicine

参考答案:

D答案为D。根据第三段最后一句，This then，was something new：a new influenza virus against which the people of the world had no ready help whatsoever 作出该项选择。其他选项在文章中根本未提。

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