单项选择题

At eight o’clock, the bell ______and all the children ran into the classroom.

A．rings
B．rang
C．has rung
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单项选择题
The test was ______difficult that she had problems finishing it on time.
A．too
B．as
C．so
单项选择题
If you give me a ______, I know I can do a good job.
A．chance
B．practice
C．luck
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