One of the suspects is _________ boy.A. a 18-year-old                 

 One of the suspects is _________ boy.

A. a 18-year-old                                                   B. an 18-years-old

C. a 18 years old                                                  D. an 18-year-old

答案

D   18-year-old作定语,其中的year用单数形式。

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