单项选择题

A．He has had thirteen decayed teeth.
B．He doesn’t have a single decayed tooth.
C．He has fewer decayed teeth than other people of his’ age.
D．He never had a single tooth pulled out before he was fifty.
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单项选择题
A．They don’t have their own cars to drive to work.B．Many of them are romantic by temperament.C．Most of them enjoy the drinks on the boat.D．They tend to be more friendly to each other.
A．They don’t have their own cars to drive to work.
B．Many of them are romantic by temperament.
C．Most of them enjoy the drinks on the boat.
D．They tend to be more friendly to each other.
填空题
Despite the pioneers’ predictions about AI, the most powerful computer could only ______now.
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