单项选择题

He was noticed ______ open the window.

A．breaking
B．broke
C．broken
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单项选择题
Ice and snow ______ houses near the North pole.
A．used to build
B．are used to building
C．are used to build
单项选择题
The telephone kept ______ until I answered.
A．ring
B．rang
C．ringing
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