| A. | was invented | B. | invented | C. | has invented |
分析 青蒿素是中国伟大科学家屠呦呦发明的.
解答 答案:A
结合语境可知屠呦呦发明青蒿素描述的是过去发生的事情故确定时态为一般过去时,主语Artemisinin是谓语动词invent的承受者,二者为被动关系所以用被动语态,故该空处为一般过去时的被动语态,其结构为:主语+was/were+及物动词的过去分词,主语 Artemisinin是单数名词,be动词用was,invent的过去分词是invented,套用结构,故选A
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,二者结合套用结构即可选出正确答案.
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