题目内容
13．Basketball ____ by a Canadian doctor named James Naismith．（ ）| A． | is invented | B． | was invented | C． | invented | D． | invents |
分析 篮球是由一个叫詹姆斯•奈史密斯的加拿大博士发明的．
解答 答案：B．
根据语境"篮球是由一个叫詹姆斯-奈史密斯的加拿大博士发明的．"，判断句子中的谓语动词用一般过去时，主语basketball是动作invent的承受者，表示"被发明"，所以用被动语态，一般过去时被动语态的构成是：主语+was/were+动词的过去分词，主语是单数名词，be动词用was，invent的过去分词是invented，故选B．
点评 本题考查时态和语态．每个时态都有标志词，熟记这些标志词是做题的关键．在没有时间状语的情况下可以根据语境来对时态做出判断．判断语态的关键则是观察主语是谓语动词的执行者还是承受者．
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