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
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单项选择题
The old woman kept one black dog and two white ______.
A．one
B．ones
C．those
单项选择题
—When ______ this kind of computer ______— Last year.
A．did...use
B．was...used
C．is... used
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