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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We were all struck ______ at the bad news he told us.
A．dumb
B．deadly
C．badly
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You may keep the dictionary as long as you like, ______ you keep it clean.
A．so long as
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C．as well as
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