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
D
考查省略句，主從句的主語一致時，可以省略從句的主語和be動詞，選B就是if it is not treated的省略，選C就是if it is untreated的省略，所以選D。
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