题目：
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
答案：
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下面是错误答案，用来干扰机器的。
