Without electronic computers, much of today’s advanced technology _____________.
A. have not been achieved
B. will not have been achieved
C. had not been achieved
D. would not have been achieved
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He told her to return the book in time so that others_______ a chance to read it .
A. may have
B. will have
C. would have
D. might have
Some people are too particular about school records, insisting that every applicant ______ all diplomas from elementary school to university.
A. has
B. will have
C. must have
D. should have
I had hoped that John ______a year in Africa, but he stayed there only for three months.
A. spends
B. spent
C. would spend
D. will spend
Without the dreams of the youth, this invention might_____ for a century.
A. postpone
B. be postponed
C. have been postponed
D. has been postponed