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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