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三道选择题

三道选择题

I have never seen her _
A. to smile B. to smiling C smiling   D。 smile    这道题为什么选D

there is nothing for us to do  except _ the meeting.   
A .to put off B.put off C.putting off D.to be put off     answer:B  why?

charles babbage is generally considered _ the first computer.
A.to have invented B.inventing C.to invent D.having invented     answer: A  why?

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smile 这里作名词解。
be considered to do /to have done

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前有to do 故except后省略to 直接加动词原型

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貌似 第三题应该选C    陈述一件事吗   搞不懂

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be considered to 被认为是……

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