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Nobody witnessed the accident, so people reached a     conclusion about the possible cause of the accident.
A.alternativeB.brilliantC.competentD.tentative
D
词义辨析。Alternative两者择一的;brilliant杰出的;competent有能力的;tentative试探性的,假设的。没有人目睹事故,所以人们只能对事故的可能起因得出假设性的结论。选D。
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