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
The number of the employees ______ in this company.
A．have doubled
B．has doubled
C．are doubled
D．were doubled
单项选择题
Since the matter was extremely ______, we dealt with it immediately.
A．tough
B．tense
C．urgent
D．instant
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