◎ 题干
From the ________ shown in the dead body, he ________to death by a certain poisonous chemical, but I can’t tell exactly which.
[     ]
A. symptoms; must have been poisoned    
B. signs; should have been poisoned
C. symbols; could have been poisoned      
D. appearances; may have been poisoned
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◎ 解析
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◎ 知识点
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