单项选择题

Use an umbrella to protect yourself ______ the rain.

A． of
B． with
C． from
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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
These old men need some help, ______
A． needn't they
B． don't they
C． need they
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