题目内容
13．The Dongying-Hainan airline for about 5months．I have taken the flights three times．（ ）| A． | is open | B． | has opened | C． | has been open | D． | has been opened |
分析 句意：东营-海南航线已开通五个月了．我已经乘坐过这个航班三次了．
解答 答案：C，根据The Dongying-Hainan airline…for about 5months，可知for+时间段，是现在完成时的时间标志，所以应用现在完成时，且动词要用延续性动词，open是非延续性动词，故要变成be+open的系表结构，又知现在完成时的结构为have/has+动词的过去分词，故选C
点评 每一种特定的时态都有其相应的时态标志，寻找其时态标志并加以认真分析可以巧解时态试题．所谓时态标志，指的就是某些特定的词、短语或句式，在通常情况下要与某种特定的时态连用，本题还要注意延续性动词和短暂性动词的区别
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