单项选择题

We think ______ our duty to pay taxes to our government.

A．that
B．this
C．its
D．it
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单项选择题
The climate of Shanghai is better than ______ of Nanjing.
A．that
B．it
C．which
D．what
单项选择题
My cousin lives in ______ US
A．A. /
B．the
C．a
D．an
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