单项选择题

One day I______ a newspaper article about the retirement of an English professor at a nearby state college.

A．came across
B．came about
C．came after
D．came at
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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
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
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