单项选择题

As early as 1637 Ohio made a decision that free, tax supported schools must be established in every town ______ 40 households or more.

A．having
B．to have
C．to have had
D．having had
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单项选择题
All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
A．had been canceled
B．have been canceled
C．were canceled
D．having been canceled
单项选择题
These excursions will give you an even deeper ______ into our language and culture.
A．inquiry
B．investigation
C．input
D．insight
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