单项选择题

We have no classes ______ Saturdays.

A．at
B．on
C．in
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单项选择题
—Are you Jim—______ .
A．Yes, I am
B．Yes, I'm
C．No, I'm not
单项选择题
______ people went to California to look for gold(金子).
A．Thousand of
B．Thousands of
C．Ten thousands of
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