要点1 consider
【例题】Charles Babbage is generally considered_______ the first computer.
A. to invent B. inventing
C. to have invented D. having invented
解析:“be considered to”(=be thought to...)“被认为……”,句中的“consider” 不作“考虑”讲,所以排除B、D 两项。一般说来,动作发生于谓语动词的动作之前,要用动词不定式的完成式。
