单项选择题

Where there is an earthquake, energy is ______ in one area along a crack in the earth crust.

A．released
B．run
C．rushed
D．escaped
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单项选择题
I don' t understand why you ______ the same mistakes.
A．keep to make
B．keeping to make
C．keep on make
D．keep on making
单项选择题
The Great Wall, its one end ______ to the east of Beijing, lies across North China.
A．extending
B．extended
C．extends
D．is extended
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