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请问,Charles babbage is generally considered ____ the first co

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请问,Charles babbage is generally considered ____ the first computers.
a.to invent b.inventing c.to have invented d.having invented
请帮我分析一下为什么选c好吗
c.to have invented
Charles Babbage is generally considered to have invented the first computer.
人们普遍认为第一台电脑是查尔斯巴比奇发明的.
首先,considered to...认为.,这是固定搭配,排除B和D .
其次,发明已经完成,排除A.