单项选择题

This is an illness that can result in total blindness_______left untreated.

A．after
B．if
C．since
D．unless
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单项选择题
A．made byB．seen inC．hinted atD．set in
A．made by
B．seen in
C．hinted at
D．set in
单项选择题
—Does Alan like hamburgers—Yes. So much _______that he eats them almost every day.
A．for
B．as
C．to
D．so
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