题目内容
18.--When _____ the abacus _____?--In the sixth century by the Chinese people.( )| A. | is,invented | B. | did,invent | C. | was,invented | D. | does,invent |
分析 -什么时候发明的算盘?-6世纪中国人发明的.
解答 正确答案:C.根据句意可知算盘由中国人6世纪发明,主语abacus和谓语invent是被动关系,且in the sixth century表示过去的时间状语,则本句应用一般过去时的被动语态,即主语+was/were+done,故选择C.
点评 本题考查被动语态,根据主谓关系判断语态,再根据时间状语确定时态即可作出选择.
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