单项选择题

—Who's the man talking to our teacher—A professor ______ a visit to our school.

A．pays
B．is paying
C．has paid
D．paying
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单项选择题
—Are you sure ______ you've met him before
A．unless
B．that
C．when
D．though
单项选择题
—Would you like to see a film with us this evening—I would like to. But I can't ______ the time because I have to finish my composition.
A．afford
B．pass
C．take
D．spend
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