问题
选择题
____, the disease will produce a powder poison that will kill the patient.
[ ]
A. If it untreated
B. If is untreated
C. If being untreated
D. If untreated
答案
答案：D
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____, the disease will produce a powder poison that will kill the patient.
[ ]
A. If it untreated
B. If is untreated
C. If being untreated
D. If untreated
答案：D
sin
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