If , the bird flu would produce a powerful poison that would kill the patients.A. not trea

If , the bird flu would produce a powerful poison that would kill the patients.
A. not treat B not treated C untreated D. Both B and C

解析：考查省略句，主从句的主语一致时，可以省略从句的主语和be动词，选B就是if it is not treated的省略，选C就是if it is untreated的省略，所以选D。

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