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．Do research in the library.B．Grade homework sets.C．Teach an introductory economic course.D．Make up homework problem.
A．Do research in the library.
B．Grade homework sets.
C．Teach an introductory economic course.
D．Make up homework problem.
填空题
increasingly
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