______ are not allowed to drive. They are not serious enough.

A、Fifteen-year-old
B、Fifteen-years-old
C、Fifteen years old
D、Fifteen-year-olds
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科目：初中英語 來源：廣東省期中題 題型：單選題

______ are not allowed to drive. They are not serious enough.
[     ]
A、Fifteen-year-old
B、Fifteen-years-old
C、Fifteen years old
D、Fifteen-year-olds

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