_______, the disease will produce a kind of poison that will kill the patient.

A．If it untreatedB．If is untreated
C．If being untreatedD．If untreated

D

解析這題考查if條件句的省略式：當主從句的主語一致時，可以省略主語和be動詞，If untreated="if" the disease is treated，句意是：如果這個病不治療的話會產(chǎn)生一種毒藥制人的命。選D

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