tom is a___boy.A.thirteen years old B.thirteen-years-old C.thirteen-year-old

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tom is a___boy.A.thirteen years old B.thirteen-years-old C.thirteen-year-old

tom is a___boy.A.thirteen years old B.thirteen-years-old C.thirteen-year-old
tom is a___boy.A.thirteen years old B.thirteen-years-old C.thirteen-year-old

tom is a___boy.A.thirteen years old B.thirteen-years-old C.thirteen-year-old
C.有连字符的时候year不可以加-s,所以B项错误;本句需要形容词或形容词短语做定语,A项不可以,所以选择C.本句意思为“汤姆是一个十三岁的男孩.

C