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-高中英语-n多题

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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

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