单项选择题

As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town ______ 50 households or more.

A. having

B. to have
C. to have had

D. having had

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单项选择题

There is a real possibility that these animals could be frightened, ______ a sudden loud noise.

A. there being

B. was there
C. should there be

D. there having been

单项选择题

If the whole operation ______ beforehand, a great deal of time and money would have been lost.

A. was not planned

B. has not been planned
C. had not been planned

D. were not planned

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