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From the ________ shown in the dead body, he ________to death by a certain poisonous chemical, but I...
题目内容：
From the ________ shown in the dead body, he ________to death by a certain poisonous chemical, but I can’t tell exactly which.
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A．symptoms; must have been poisoned |
B．signs; should have been poisoned |
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C．symbols; could have been poisoned |
D．appearances; may have been poisoned |
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