Charles Babbage is generally considered ________ the first computer. [ ]A.

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Charles Babbage is generally considered ________ the first computer.   [     ]
A. to invent
B. inventing
C. to have invented
D. having invented

答案

举一反三

This problem is said _____ three times.  [     ]
A. to have been talked
B. to have discussed
C. having been discussed
D. to have been talked about

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Everybody believed the man ______ away the diamond ring.  [     ]
A. be taken
B. taking
C. to take
D. to have taken

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AIDS is said________the biggest health challenge to both men and women in that area over the
past few years.  [     ]
A. that it is
B. to be
C. that it has been
D. to have been

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Jack is said____    for a fortnight  since he went to bed.[     ]
A. to sleep
B. to be sleeping
C. to be slept
D. to have been sleeping

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The student you considered ______ hardest failed to pass the important examination.
A. to have studied
B. having studied
C. to study
D. studying

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