问题

Charles Babbage is generally considered ______ thefirst computer.
A:to invent
B:inventing
C:to haveinvented
D:havinginvented
B:inventing
C:to haveinvented
D:havinginvented
正确答案是:
同类题型
I ____ my pen on the table, so I can’t write down his telephone number.
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In a harmonious society,we’d better prevent pollution _______ happily. [ ]
Did you visit the zoo? — No, we_______have visited it, but we spent too much time shopping.