问题
From the symptoms shown in the dead body, he ________to death by a certain poisonous chemical, but I can’t tell exactly which. [ ]
A: must have been poisoned
B: should have been poisoned
C: could have been poisoned
D: may have been poisoned
B: should have been poisoned
C: could have been poisoned
D: may have been poisoned
正确答案是：
同类题型
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