单项选择题

A．for
B．because
C．since
D．as
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单项选择题
What is true about the colour of US coins
A. They are all silver coloured.
B. They are not all silver coloured.
C. The one-cent piece is silver coloured.
单项选择题
Where are they
A． In a bank.
B． At a post.
C． In a department store.
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