单项选择题

When he explained it again and again, the students' patience ______.

A．ran over
B．ran on
C．ran out
D．ran off
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单项选择题
You may keep the dictionary as long as you like, ______ you keep it clean.
A．so long as
B．so far as
C．as well as
D．as soon as
单项选择题
Although this disease is incurable at present, they keep expecting ______.
A．magic
B．miracles
C．wonders
D．wisdom
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