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
Purchasing the new production line will be a ______ deal for the company.
A．profitable
B．tremendous
C．forceful
D．favorite
单项选择题
The birth rate in a city ______ to fall as its gross domestic product (GDP) rises steadily.
A．estimates
B．anticipates
C．assumes
D．tends
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