Hefailedinthedrivingtestagain.He_______.A.must have disappointedB.must have been disappointedC.might be disappointedD.couldn’t be disappointed

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B解析考察时态，根据题意他在驾照考试中失败了。他一定很失望。可知是对已发生事情的判断，瞬间动词失望不能用于完成时态，故需用瞬间动词的被动语态，选B。

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