Nobody witnessed the accident, so people reached a     conclusion about the possible cause of the accident.
A．a(chǎn)lternativeB．brilliantC．competentD．tentative
D
詞義辨析。Alternative兩者擇一的；brilliant杰出的；competent有能力的；tentative試探性的，假設(shè)的。沒有人目睹事故，所以人們只能對事故的可能起因得出假設(shè)性的結(jié)論。選D。
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