单项选择题

Call a taxi, ______ you will miss the train.

A．and
B．though
C．or
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单项选择题
Henry ______ be at home because he phoned me from the farm just now.
A．mustn't
B．isn't able to
C．can't
单项选择题
The old woman kept one black dog and two white ______.
A．one
B．ones
C．those
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