题目内容
17．That ancient tower is part of our city's history．It _______ many years ago．（ ）| A． | builds | B． | built | C． | was built | D． | is built |
分析 那个古塔是我们城市历史的一部分，它是许多年前建造的．
解答 答案：C 根据many years ago可知，这是表示过去的时间状语，所以运用一般过去时态；又因为主语it是动词build的承受者，应该用被动语态．一般过去时态的被动语态的构成是：was/were+动词的过去分词，主语是单数，所以用助动词用was，故选C．
点评 判断动词的时态，要通过所给的时间状语或语境去判断动词存在的状态；判断动词的语态，要看看主语是谓语动词的执行者还是承受者．
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