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．An analysis of early presidential elections.B．A comparison of political journals.C．The use of computers in calculating election results.D．The impact of television on recent presidential elections.
A．An analysis of early presidential elections.
B．A comparison of political journals.
C．The use of computers in calculating election results.
D．The impact of television on recent presidential elections.
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