单项选择题

Most of the satellites do not change ______ positions.

A．their
B．its
C．them
D．the
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单项选择题
Tom ______ more than twenty pounds for the dictionary.
A．spent
B．paid
C．cost
D．took
单项选择题
I wonder why ______ impossible for you to do the work by yourself.
A．you
B．you are
C．it is
D．you were
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