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
However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
单项选择题
Tony is very disappointed______ the results of the exam.
A．with
B．for
C．toward
D．on
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