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
I''m sure he is up to the job______ he would give his mind to it.
A．if only
B．incase
C．until
D．unless
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