单项选择题

The telephone kept ______ until I answered.

A．ring
B．rang
C．ringing
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单项选择题
He was noticed ______ open the window.
A．breaking
B．broke
C．broken
单项选择题
It's ______ to send letters by email than by post.
A．far faster
B．farther fast
C．farther faster
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