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、Tom is a top student in our class , How        it be that he was a failure in the last exam?
A.canB.shouldC.mayD.nust
B

试题分析:考察情态动词用法。本句中的should并不表示“应该”,而是表示“竟然”指的是意料之外的事情。句意:Tom是一个优秀生,他怎么可能竟然会在上次考试里不及格呢?根据句意说明B正确。
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