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18.He  looks  so happy.Maybe  he ________he won the first  prize.(  )
A.knowsB.knewC.has  known

分析 他看起来很高兴.也许他已经知道了他获得了一等奖.

解答 答案:C.考查动词时态.句意"他看起来很高兴.也许他已经知道了他获得了一等奖."现在完成时,一种是强调过去对现在的影响,另一种指动作从过去延续到现在,也就是经常说的延续时.根据题干He looks so happy.Maybe he ________he won the first prize.可知是说他看起来很高兴.也许他已经知道了他获得了一等奖.用现在完成时has known.故选C.

点评 仔细分析句子的结构,根据具体的内容作答.

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