1、19.Charles Babbage is generally considered ______ the first computers.
A.to invent
B.inventing
C.to have invented
D.having invented
请问这题为什么选C而不选A呢
人气：236 ℃ 时间：2020-02-05 15:30:09
解答
be considered to do sth 被认为去做某事,这件事是还没做的,不定式to do有将来的含义
而be considered to have done 被认为做过某事,to have done是不定式的完成式,表示这事情已经做过了,发生在过去
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