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
If tap water were as dangerous as some people think, ______ would be getting sick.
A．a lot of more us
B．most a lot of us
C．a lot of us more
D．a lot more of us
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．in case
C．until
D．unless
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