题目内容
17．The highway from Zunyi to Renhuai_____for about two years．（ ）| A． | has opened | B． | has been open | C． | has been opened |
分析 从遵义到仁怀的高速公路已经开通两年了．
解答 答案：B．考查现在完成时态．句意"从遵义到仁怀的高速公路已经开通两年了．"．for+段时间，通常用于现在完成时态，结构是have/has+done．主语highway单数，因此用has．highway是动作open开通的承受者，因此用现在完成时态的被动语态．open非延续性动词，现在完成时态，用be open，这里的open是形容词，表示开通的状态．be的过去分词是been．因此用has been open，答案是B．
点评 现在完成时态，由"have/has+过去分词"构成，表示动作发生在过去，但与现在的情况有联系．也表示从过去某一时间开始一直延续到现在并还可能继续延续下去的动作．结合语境，注意人称变化及动词过去分词变化．
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