题目内容
18．He looks so happy．Maybe he ________he won the first prize．（ ）| A． | knows | B． | knew | C． | 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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