单项选择题

The stones ______ houses and bridges.

A．are used to build
B．used to build
C．are used to building
D．used to building
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单项选择题
______ of them knew about the draft plan because it was kept a secret
A．Each
B．None
C．All
D．No one
单项选择题
She got very angry ______ the sight of her husband walking with another woman.
A．by
B．at
C．on
D．of
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