单项选择题

John is always ready ______ others.

A．helps
B．to help
C．help
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单项选择题
Today his room is ______ as usual.
A．so dirty
B．as dirty
C．more dirty
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
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