Tony is twelve old but his sister is only one old.A. year; yearB. years; yearsC. years; y

问题补充：

Tony is twelve old, but his sister is only one old.

A. year; year

B. years; years

C. years; year

D. year; years

答案：

A. year; year

B. years; years

(答案→)C. years; year

D. year; years

解析：表示“年龄多大”时用“…years01d”结构。前面的基数词是one就用year old：大于1就用years old。因此选c。

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