单项选择题

You'd better hurry, ______ you might be late for class.

A．or
B．and
C．unless
D．but
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单项选择题
Their idea was to get us to ______ the strike at once.
A．call at
B．call off
C．call in
D．call for
单项选择题
The sea separates Taiwan ______ the Chinese mainland.
A．at
B．into
C．from
D．of
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